selftests: netdevsim: Add test for nexthop offload API

Test various aspects of the nexthop offload API on top of the netdevsim
implementation. Both good and bad flows are tested.

Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/tools/testing/selftests/drivers/net/netdevsim/nexthop.sh b/tools/testing/selftests/drivers/net/netdevsim/nexthop.sh
new file mode 100755 (executable)
index 0000000..be0c1b5
--- /dev/null
+++ b/tools/testing/selftests/drivers/net/netdevsim/nexthop.sh
@@ -0,0 +1,436 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+#
+# This test is for checking the nexthop offload API. It makes use of netdevsim
+# which registers a listener to the nexthop notification chain.
+
+lib_dir=$(dirname $0)/../../../net/forwarding
+
+ALL_TESTS="
+       nexthop_single_add_test
+       nexthop_single_add_err_test
+       nexthop_group_add_test
+       nexthop_group_add_err_test
+       nexthop_group_replace_test
+       nexthop_group_replace_err_test
+       nexthop_single_replace_test
+       nexthop_single_replace_err_test
+       nexthop_single_in_group_replace_test
+       nexthop_single_in_group_replace_err_test
+       nexthop_single_in_group_delete_test
+       nexthop_single_in_group_delete_err_test
+       nexthop_replay_test
+       nexthop_replay_err_test
+"
+NETDEVSIM_PATH=/sys/bus/netdevsim/
+DEV_ADDR=1337
+DEV=netdevsim${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
+
+nexthop_check()
+{
+       local nharg="$1"; shift
+       local expected="$1"; shift
+
+       out=$($IP nexthop show ${nharg} | sed -e 's/ *$//')
+       if [[ "$out" != "$expected" ]]; then
+               return 1
+       fi
+
+       return 0
+}
+
+nexthop_resource_check()
+{
+       local expected_occ=$1; shift
+
+       occ=$($DEVLINK -jp resource show $DEVLINK_DEV \
+               | jq '.[][][] | select(.name=="nexthops") | .["occ"]')
+
+       if [ $expected_occ -ne $occ ]; then
+               return 1
+       fi
+
+       return 0
+}
+
+nexthop_resource_set()
+{
+       local size=$1; shift
+
+       $DEVLINK resource set $DEVLINK_DEV path nexthops size $size
+       $DEVLINK dev reload $DEVLINK_DEV
+}
+
+nexthop_single_add_test()
+{
+       RET=0
+
+       $IP nexthop add id 1 via 192.0.2.2 dev dummy1
+       nexthop_check "id 1" "id 1 via 192.0.2.2 dev dummy1 scope link trap"
+       check_err $? "Unexpected nexthop entry"
+
+       nexthop_resource_check 1
+       check_err $? "Wrong nexthop occupancy"
+
+       $IP nexthop del id 1
+       nexthop_resource_check 0
+       check_err $? "Wrong nexthop occupancy after delete"
+
+       log_test "Single nexthop add and delete"
+}
+
+nexthop_single_add_err_test()
+{
+       RET=0
+
+       nexthop_resource_set 1
+
+       $IP nexthop add id 1 via 192.0.2.2 dev dummy1
+
+       $IP nexthop add id 2 via 192.0.2.3 dev dummy1 &> /dev/null
+       check_fail $? "Nexthop addition succeeded when should fail"
+
+       nexthop_resource_check 1
+       check_err $? "Wrong nexthop occupancy"
+
+       log_test "Single nexthop add failure"
+
+       $IP nexthop flush &> /dev/null
+       nexthop_resource_set 9999
+}
+
+nexthop_group_add_test()
+{
+       RET=0
+
+       $IP nexthop add id 1 via 192.0.2.2 dev dummy1
+       $IP nexthop add id 2 via 192.0.2.3 dev dummy1
+
+       $IP nexthop add id 10 group 1/2
+       nexthop_check "id 10" "id 10 group 1/2 trap"
+       check_err $? "Unexpected nexthop group entry"
+
+       nexthop_resource_check 4
+       check_err $? "Wrong nexthop occupancy"
+
+       $IP nexthop del id 10
+       nexthop_resource_check 2
+       check_err $? "Wrong nexthop occupancy after delete"
+
+       $IP nexthop add id 10 group 1,20/2,39
+       nexthop_check "id 10" "id 10 group 1,20/2,39 trap"
+       check_err $? "Unexpected weighted nexthop group entry"
+
+       nexthop_resource_check 61
+       check_err $? "Wrong weighted nexthop occupancy"
+
+       $IP nexthop del id 10
+       nexthop_resource_check 2
+       check_err $? "Wrong nexthop occupancy after delete"
+
+       log_test "Nexthop group add and delete"
+
+       $IP nexthop flush &> /dev/null
+}
+
+nexthop_group_add_err_test()
+{
+       RET=0
+
+       nexthop_resource_set 2
+
+       $IP nexthop add id 1 via 192.0.2.2 dev dummy1
+       $IP nexthop add id 2 via 192.0.2.3 dev dummy1
+
+       $IP nexthop add id 10 group 1/2 &> /dev/null
+       check_fail $? "Nexthop group addition succeeded when should fail"
+
+       nexthop_resource_check 2
+       check_err $? "Wrong nexthop occupancy"
+
+       log_test "Nexthop group add failure"
+
+       $IP nexthop flush &> /dev/null
+       nexthop_resource_set 9999
+}
+
+nexthop_group_replace_test()
+{
+       RET=0
+
+       $IP nexthop add id 1 via 192.0.2.2 dev dummy1
+       $IP nexthop add id 2 via 192.0.2.3 dev dummy1
+       $IP nexthop add id 3 via 192.0.2.4 dev dummy1
+       $IP nexthop add id 10 group 1/2
+
+       $IP nexthop replace id 10 group 1/2/3
+       nexthop_check "id 10" "id 10 group 1/2/3 trap"
+       check_err $? "Unexpected nexthop group entry"
+
+       nexthop_resource_check 6
+       check_err $? "Wrong nexthop occupancy"
+
+       log_test "Nexthop group replace"
+
+       $IP nexthop flush &> /dev/null
+}
+
+nexthop_group_replace_err_test()
+{
+       RET=0
+
+       nexthop_resource_set 5
+
+       $IP nexthop add id 1 via 192.0.2.2 dev dummy1
+       $IP nexthop add id 2 via 192.0.2.3 dev dummy1
+       $IP nexthop add id 3 via 192.0.2.4 dev dummy1
+       $IP nexthop add id 10 group 1/2
+
+       $IP nexthop replace id 10 group 1/2/3 &> /dev/null
+       check_fail $? "Nexthop group replacement succeeded when should fail"
+
+       nexthop_check "id 10" "id 10 group 1/2 trap"
+       check_err $? "Unexpected nexthop group entry after failure"
+
+       nexthop_resource_check 5
+       check_err $? "Wrong nexthop occupancy after failure"
+
+       log_test "Nexthop group replace failure"
+
+       $IP nexthop flush &> /dev/null
+       nexthop_resource_set 9999
+}
+
+nexthop_single_replace_test()
+{
+       RET=0
+
+       $IP nexthop add id 1 via 192.0.2.2 dev dummy1
+
+       $IP nexthop replace id 1 via 192.0.2.3 dev dummy1
+       nexthop_check "id 1" "id 1 via 192.0.2.3 dev dummy1 scope link trap"
+       check_err $? "Unexpected nexthop entry"
+
+       nexthop_resource_check 1
+       check_err $? "Wrong nexthop occupancy"
+
+       log_test "Single nexthop replace"
+
+       $IP nexthop flush &> /dev/null
+}
+
+nexthop_single_replace_err_test()
+{
+       RET=0
+
+       # This is supposed to cause the replace to fail because the new nexthop
+       # is programmed before deleting the replaced one.
+       nexthop_resource_set 1
+
+       $IP nexthop add id 1 via 192.0.2.2 dev dummy1
+
+       $IP nexthop replace id 1 via 192.0.2.3 dev dummy1 &> /dev/null
+       check_fail $? "Nexthop replace succeeded when should fail"
+
+       nexthop_check "id 1" "id 1 via 192.0.2.2 dev dummy1 scope link trap"
+       check_err $? "Unexpected nexthop entry after failure"
+
+       nexthop_resource_check 1
+       check_err $? "Wrong nexthop occupancy after failure"
+
+       log_test "Single nexthop replace failure"
+
+       $IP nexthop flush &> /dev/null
+       nexthop_resource_set 9999
+}
+
+nexthop_single_in_group_replace_test()
+{
+       RET=0
+
+       $IP nexthop add id 1 via 192.0.2.2 dev dummy1
+       $IP nexthop add id 2 via 192.0.2.3 dev dummy1
+       $IP nexthop add id 10 group 1/2
+
+       $IP nexthop replace id 1 via 192.0.2.4 dev dummy1
+       check_err $? "Failed to replace nexthop when should not"
+
+       nexthop_check "id 10" "id 10 group 1/2 trap"
+       check_err $? "Unexpected nexthop group entry"
+
+       nexthop_resource_check 4
+       check_err $? "Wrong nexthop occupancy"
+
+       log_test "Single nexthop replace while in group"
+
+       $IP nexthop flush &> /dev/null
+}
+
+nexthop_single_in_group_replace_err_test()
+{
+       RET=0
+
+       nexthop_resource_set 5
+
+       $IP nexthop add id 1 via 192.0.2.2 dev dummy1
+       $IP nexthop add id 2 via 192.0.2.3 dev dummy1
+       $IP nexthop add id 10 group 1/2
+
+       $IP nexthop replace id 1 via 192.0.2.4 dev dummy1 &> /dev/null
+       check_fail $? "Nexthop replacement succeeded when should fail"
+
+       nexthop_check "id 1" "id 1 via 192.0.2.2 dev dummy1 scope link trap"
+       check_err $? "Unexpected nexthop entry after failure"
+
+       nexthop_check "id 10" "id 10 group 1/2 trap"
+       check_err $? "Unexpected nexthop group entry after failure"
+
+       nexthop_resource_check 4
+       check_err $? "Wrong nexthop occupancy"
+
+       log_test "Single nexthop replace while in group failure"
+
+       $IP nexthop flush &> /dev/null
+       nexthop_resource_set 9999
+}
+
+nexthop_single_in_group_delete_test()
+{
+       RET=0
+
+       $IP nexthop add id 1 via 192.0.2.2 dev dummy1
+       $IP nexthop add id 2 via 192.0.2.3 dev dummy1
+       $IP nexthop add id 10 group 1/2
+
+       $IP nexthop del id 1
+       nexthop_check "id 10" "id 10 group 2 trap"
+       check_err $? "Unexpected nexthop group entry"
+
+       nexthop_resource_check 2
+       check_err $? "Wrong nexthop occupancy"
+
+       log_test "Single nexthop delete while in group"
+
+       $IP nexthop flush &> /dev/null
+}
+
+nexthop_single_in_group_delete_err_test()
+{
+       RET=0
+
+       # First, nexthop 1 will be deleted, which will reduce the occupancy to
+       # 5. Afterwards, a replace notification will be sent for nexthop group
+       # 10 with only two nexthops. Since the new group is allocated before
+       # the old is deleted, the replacement will fail as it will result in an
+       # occupancy of 7.
+       nexthop_resource_set 6
+
+       $IP nexthop add id 1 via 192.0.2.2 dev dummy1
+       $IP nexthop add id 2 via 192.0.2.3 dev dummy1
+       $IP nexthop add id 3 via 192.0.2.4 dev dummy1
+       $IP nexthop add id 10 group 1/2/3
+
+       $IP nexthop del id 1
+
+       nexthop_resource_check 5
+       check_err $? "Wrong nexthop occupancy"
+
+       log_test "Single nexthop delete while in group failure"
+
+       $IP nexthop flush &> /dev/null
+       nexthop_resource_set 9999
+}
+
+nexthop_replay_test()
+{
+       RET=0
+
+       $IP nexthop add id 1 via 192.0.2.2 dev dummy1
+       $IP nexthop add id 2 via 192.0.2.3 dev dummy1
+       $IP nexthop add id 10 group 1/2
+
+       $DEVLINK dev reload $DEVLINK_DEV
+       check_err $? "Failed to reload when should not"
+
+       nexthop_check "id 1" "id 1 via 192.0.2.2 dev dummy1 scope link trap"
+       check_err $? "Unexpected nexthop entry after reload"
+
+       nexthop_check "id 2" "id 2 via 192.0.2.3 dev dummy1 scope link trap"
+       check_err $? "Unexpected nexthop entry after reload"
+
+       nexthop_check "id 10" "id 10 group 1/2 trap"
+       check_err $? "Unexpected nexthop group entry after reload"
+
+       nexthop_resource_check 4
+       check_err $? "Wrong nexthop occupancy"
+
+       log_test "Nexthop replay"
+
+       $IP nexthop flush &> /dev/null
+}
+
+nexthop_replay_err_test()
+{
+       RET=0
+
+       $IP nexthop add id 1 via 192.0.2.2 dev dummy1
+       $IP nexthop add id 2 via 192.0.2.3 dev dummy1
+       $IP nexthop add id 10 group 1/2
+
+       # Reduce size of nexthop resource so that reload will fail.
+       $DEVLINK resource set $DEVLINK_DEV path nexthops size 3
+       $DEVLINK dev reload $DEVLINK_DEV &> /dev/null
+       check_fail $? "Reload succeeded when should fail"
+
+       $DEVLINK resource set $DEVLINK_DEV path nexthops size 9999
+       $DEVLINK dev reload $DEVLINK_DEV
+       check_err $? "Failed to reload when should not"
+
+       log_test "Nexthop replay failure"
+
+       $IP nexthop flush &> /dev/null
+}
+
+setup_prepare()
+{
+       local netdev
+
+       modprobe netdevsim &> /dev/null
+
+       echo "$DEV_ADDR 1" > ${NETDEVSIM_PATH}/new_device
+       while [ ! -d $SYSFS_NET_DIR ] ; do :; done
+
+       set -e
+
+       ip netns add testns1
+       devlink dev reload $DEVLINK_DEV netns testns1
+
+       IP="ip -netns testns1"
+       DEVLINK="devlink -N testns1"
+
+       $IP link add name dummy1 up type dummy
+       $IP address add 192.0.2.1/24 dev dummy1
+
+       set +e
+}
+
+cleanup()
+{
+       pre_cleanup
+       ip netns del testns1
+       echo "$DEV_ADDR" > ${NETDEVSIM_PATH}/del_device
+       modprobe -r netdevsim &> /dev/null
+}
+
+trap cleanup EXIT
+
+setup_prepare
+
+tests_run
+
+exit $EXIT_STATUS