selftests: mlxsw: Add ingress RIF configuration test for 802.1D bridge

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 VLAN-unaware bridges (802.1D), the FID classification is done according
to {Port, VID}. When a RIF is added on top of a FID, all the existing
{Port, VID}->FID mappings 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 {Port, VID}->FID
classification, regardless of the order of the configuration.

 # ./ingress_rif_conf_1d.sh
 TEST: Add RIF for existing {port, VID}->FID mapping                 [ OK ]
 TEST: Add {port, VID}->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>

diff --git a/tools/testing/selftests/drivers/net/mlxsw/ingress_rif_conf_1d.sh b/tools/testing/selftests/drivers/net/mlxsw/ingress_rif_conf_1d.sh
new file mode 100755 (executable)
index 0000000..df2b099
--- /dev/null
+++ b/tools/testing/selftests/drivers/net/mlxsw/ingress_rif_conf_1d.sh
@@ -0,0 +1,264 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+
+# Test routing over bridge and verify that the order of configuration does not
+# impact switch behavior. Verify that RIF is added correctly for existing
+# mappings and that new mappings use the correct RIF.
+
+# +-------------------+                   +--------------------+
+# | H1                |                   | H2                 |
+# |                   |                   |                    |
+# |         $h1.10 +  |                   |  + $h2.10          |
+# |   192.0.2.1/28 |  |                   |  | 192.0.2.3/28    |
+# |                |  |                   |  |                 |
+# |            $h1 +  |                   |  + $h2             |
+# +----------------|--+                   +--|-----------------+
+#                  |                         |
+# +----------------|-------------------------|-----------------+
+# | SW             |                         |                 |
+# | +--------------|-------------------------|---------------+ |
+# | |        $swp1 +                         + $swp2         | |
+# | |              |                         |               | |
+# | |     $swp1.10 +                         + $swp2.10      | |
+# | |                                                        | |
+# | |                           br0                          | |
+# | |                       192.0.2.2/28                     | |
+# | +--------------------------------------------------------+ |
+# |                                                            |
+# |      $swp3.10 +                                            |
+# | 192.0.2.17/28 |                                            |
+# |               |                                            |
+# |         $swp3 +                                            |
+# +---------------|--------------------------------------------+
+#                 |
+# +---------------|--+
+# |           $h3 +  |
+# |               |  |
+# |        $h3.10 +  |
+# | 192.0.2.18/28    |
+# |                  |
+# | H3               |
+# +------------------+
+
+lib_dir=$(dirname $0)/../../../net/forwarding
+
+ALL_TESTS="
+       port_vid_map_rif
+       rif_port_vid_map
+"
+
+NUM_NETIFS=6
+source $lib_dir/lib.sh
+source $lib_dir/tc_common.sh
+source $lib_dir/devlink_lib.sh
+
+h1_create()
+{
+       simple_if_init $h1
+       vlan_create $h1 10 v$h1 192.0.2.1/28
+
+       ip route add 192.0.2.16/28 vrf v$h1 nexthop via 192.0.2.2
+}
+
+h1_destroy()
+{
+       ip route del 192.0.2.16/28 vrf v$h1 nexthop via 192.0.2.2
+
+       vlan_destroy $h1 10
+       simple_if_fini $h1
+}
+
+h2_create()
+{
+       simple_if_init $h2
+       vlan_create $h2 10 v$h2 192.0.2.3/28
+}
+
+h2_destroy()
+{
+       vlan_destroy $h2 10
+       simple_if_fini $h2
+}
+
+h3_create()
+{
+       simple_if_init $h3
+       vlan_create $h3 10 v$h3 192.0.2.18/28
+
+       ip route add 192.0.2.0/28 vrf v$h3 nexthop via 192.0.2.17
+}
+
+h3_destroy()
+{
+       ip route del 192.0.2.0/28 vrf v$h3 nexthop via 192.0.2.17
+
+       vlan_destroy $h3 10
+       simple_if_fini $h3
+}
+
+switch_create()
+{
+       ip link set dev $swp1 up
+
+       ip link add dev br0 type bridge mcast_snooping 0
+
+       # By default, a link-local address is generated when netdevice becomes
+       # up. Adding an address to the bridge will cause creating a RIF for it.
+       # Prevent generating link-local address to be able to control when the
+       # RIF is added.
+       sysctl_set net.ipv6.conf.br0.addr_gen_mode 1
+       ip link set dev br0 up
+
+       ip link set dev $swp2 up
+       vlan_create $swp2 10
+       ip link set dev $swp2.10 master br0
+
+       ip link set dev $swp3 up
+       vlan_create $swp3 10 "" 192.0.2.17/28
+       tc qdisc add dev $swp3 clsact
+
+       # Replace neighbor to avoid 1 packet which is forwarded in software due
+       # to "unresolved neigh".
+       ip neigh replace dev $swp3.10 192.0.2.18 lladdr $(mac_get $h3.10)
+}
+
+switch_destroy()
+{
+       tc qdisc del dev $swp3 clsact
+       vlan_destroy $swp3 10
+       ip link set dev $swp3 down
+
+       ip link set dev $swp2.10 nomaster
+       vlan_destroy $swp2 10
+       ip link set dev $swp2 down
+
+       ip link set dev br0 down
+       sysctl_restore net.ipv6.conf.br0.addr_gen_mode
+       ip link del dev br0
+
+       ip link set dev $swp1 down
+}
+
+setup_prepare()
+{
+       h1=${NETIFS[p1]}
+       swp1=${NETIFS[p2]}
+
+       swp2=${NETIFS[p3]}
+       h2=${NETIFS[p4]}
+
+       swp3=${NETIFS[p5]}
+       h3=${NETIFS[p6]}
+
+       vrf_prepare
+       forwarding_enable
+
+       h1_create
+       h2_create
+       h3_create
+
+       switch_create
+}
+
+cleanup()
+{
+       pre_cleanup
+
+       switch_destroy
+
+       h3_destroy
+       h2_destroy
+       h1_destroy
+
+       forwarding_restore
+       vrf_cleanup
+}
+
+bridge_rif_add()
+{
+       rifs_occ_t0=$(devlink_resource_occ_get rifs)
+       __addr_add_del br0 add 192.0.2.2/28
+       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"
+
+       sleep 1
+}
+
+bridge_rif_del()
+{
+       __addr_add_del br0 del 192.0.2.2/28
+}
+
+port_vid_map_rif()
+{
+       RET=0
+
+       # First add {port, VID}->FID for $swp1.10, then add a RIF and verify
+       # that packets can be routed via the existing mapping.
+       vlan_create $swp1 10
+       ip link set dev $swp1.10 master br0
+       bridge_rif_add
+
+       # The hardware matches on the first ethertype which is not VLAN,
+       # so the protocol should be IP.
+       tc filter add dev $swp3 egress protocol ip pref 1 handle 101 \
+               flower skip_sw dst_ip 192.0.2.18 action pass
+
+       ping_do $h1.10 192.0.2.18
+       check_err $? "Ping failed"
+
+       tc_check_at_least_x_packets "dev $swp3 egress" 101 10
+       check_err $? "Packets were not routed in hardware"
+
+       log_test "Add RIF for existing {port, VID}->FID mapping"
+
+       tc filter del dev $swp3 egress
+
+       bridge_rif_del
+       ip link set dev $swp1.10 nomaster
+       vlan_destroy $swp1 10
+}
+
+rif_port_vid_map()
+{
+       RET=0
+
+       # First add an address to the bridge, which will create a RIF on top of
+       # it, then add a new {port, VID}->FID mapping and verify that packets
+       # can be routed via the new mapping.
+       bridge_rif_add
+       vlan_create $swp1 10
+       ip link set dev $swp1.10 master br0
+
+       # The hardware matches on the first ethertype which is not VLAN,
+       # so the protocol should be IP.
+       tc filter add dev $swp3 egress protocol ip pref 1 handle 101 \
+               flower skip_sw dst_ip 192.0.2.18 action pass
+
+       ping_do $h1.10 192.0.2.18
+       check_err $? "Ping failed"
+
+       tc_check_at_least_x_packets "dev $swp3 egress" 101 10
+       check_err $? "Packets were not routed in hardware"
+
+       log_test "Add {port, VID}->FID mapping for FID with a RIF"
+
+       tc filter del dev $swp3 egress
+
+       ip link set dev $swp1.10 nomaster
+       vlan_destroy $swp1 10
+       bridge_rif_del
+}
+
+trap cleanup EXIT
+
+setup_prepare
+setup_wait
+
+tests_run
+
+exit $EXIT_STATUS