selftests: forwarding: vxlan_bridge_1d: Add flood test

Test that when sending traffic to an unlearned MAC address, the traffic
is flooded to both remote VXLAN endpoints.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/tools/testing/selftests/net/forwarding/vxlan_bridge_1d.sh b/tools/testing/selftests/net/forwarding/vxlan_bridge_1d.sh
index 0e3d7ab..1edd518 100755 (executable)
--- a/tools/testing/selftests/net/forwarding/vxlan_bridge_1d.sh
+++ b/tools/testing/selftests/net/forwarding/vxlan_bridge_1d.sh
@@ -66,6 +66,7 @@ export VXPORT
 
 : ${ALL_TESTS:="
        ping_ipv4
+       test_flood
     "}
 
 NUM_NETIFS=6
@@ -289,6 +290,110 @@ ping_ipv4()
        ping_test $h1 192.0.2.4 ": local->remote 2"
 }
 
+maybe_in_ns()
+{
+       echo ${1:+in_ns} $1
+}
+
+__flood_counter_add_del()
+{
+       local add_del=$1; shift
+       local dev=$1; shift
+       local ns=$1; shift
+
+       # Putting the ICMP capture both to HW and to SW will end up
+       # double-counting the packets that are trapped to slow path, such as for
+       # the unicast test. Adding either skip_hw or skip_sw fixes this problem,
+       # but with skip_hw, the flooded packets are not counted at all, because
+       # those are dropped due to MAC address mismatch; and skip_sw is a no-go
+       # for veth-based topologies.
+       #
+       # So try to install with skip_sw and fall back to skip_sw if that fails.
+
+       $(maybe_in_ns $ns) __icmp_capture_add_del          \
+                          $add_del 100 "" $dev skip_sw 2>/dev/null || \
+       $(maybe_in_ns $ns) __icmp_capture_add_del          \
+                          $add_del 100 "" $dev skip_hw
+}
+
+flood_counter_install()
+{
+       __flood_counter_add_del add "$@"
+}
+
+flood_counter_uninstall()
+{
+       __flood_counter_add_del del "$@"
+}
+
+flood_fetch_stat()
+{
+       local dev=$1; shift
+       local ns=$1; shift
+
+       $(maybe_in_ns $ns) tc_rule_stats_get $dev 100 ingress
+}
+
+flood_fetch_stats()
+{
+       local counters=("${@}")
+       local counter
+
+       for counter in "${counters[@]}"; do
+               flood_fetch_stat $counter
+       done
+}
+
+vxlan_flood_test()
+{
+       local mac=$1; shift
+       local dst=$1; shift
+       local -a expects=("${@}")
+
+       local -a counters=($h2 "vx2 ns1" "vx2 ns2")
+       local counter
+       local key
+
+       for counter in "${counters[@]}"; do
+               flood_counter_install $counter
+       done
+
+       local -a t0s=($(flood_fetch_stats "${counters[@]}"))
+       $MZ $h1 -c 10 -d 100msec -p 64 -b $mac -B $dst -t icmp -q
+       sleep 1
+       local -a t1s=($(flood_fetch_stats "${counters[@]}"))
+
+       for key in ${!t0s[@]}; do
+               local delta=$((t1s[$key] - t0s[$key]))
+               local expect=${expects[$key]}
+
+               ((expect == delta))
+               check_err $? "${counters[$key]}: Expected to capture $expect packets, got $delta."
+       done
+
+       for counter in "${counters[@]}"; do
+               flood_counter_uninstall $counter
+       done
+}
+
+__test_flood()
+{
+       local mac=$1; shift
+       local dst=$1; shift
+       local what=$1; shift
+
+       RET=0
+
+       vxlan_flood_test $mac $dst 10 10 10
+
+       log_test "VXLAN: $what"
+}
+
+test_flood()
+{
+       __test_flood de:ad:be:ef:13:37 192.0.2.100 "flood"
+}
+
 test_all()
 {
        echo "Running tests with UDP port $VXPORT"