Commit 5e624215 authored Apr 19, 2022 by Ido Schimmel Committed by David S. Miller Apr 20, 2022

selftests: mlxsw: vxlan_flooding_ipv6: Prevent flooding of unwanted packets

The test verifies that packets are correctly flooded by the bridge and
the VXLAN device by matching on the encapsulated packets at the other
end. However, if packets other than those generated by the test also
ingress the bridge (e.g., MLD packets), they will be flooded as well and
interfere with the expected count.

Make the test more robust by making sure that only the packets generated
by the test can ingress the bridge. Drop all the rest using tc filters
on the egress of 'br0' and 'h1'.

In the software data path, the problem can be solved by matching on the
inner destination MAC or dropping unwanted packets at the egress of the
VXLAN device, but this is not currently supported by mlxsw.

Fixes: d01724dd ("selftests: mlxsw: spectrum-2: Add a test for VxLAN flooding with IPv6")
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Amit Cohen <amcohen@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 044011fd

tools/testing/selftests/drivers/net/mlxsw/spectrum-2/vxlan_flooding_ipv6.sh

+17 −0

Original line number	Diff line number	Diff line
		@@ -159,6 +159,17 @@ flooding_remotes_add()
		local lsb
		local i

		# Prevent unwanted packets from entering the bridge and interfering
		# with the test.
		tc qdisc add dev br0 clsact
		tc filter add dev br0 egress protocol all pref 1 handle 1 \
		matchall skip_hw action drop
		tc qdisc add dev $h1 clsact
		tc filter add dev $h1 egress protocol all pref 1 handle 1 \
		flower skip_hw dst_mac de:ad:be:ef:13:37 action pass
		tc filter add dev $h1 egress protocol all pref 2 handle 2 \
		matchall skip_hw action drop

		for i in $(eval echo {1..$num_remotes}); do
		lsb=$((i + 1))

		@@ -195,6 +206,12 @@ flooding_filters_del()
		done

		tc qdisc del dev $rp2 clsact

		tc filter del dev $h1 egress protocol all pref 2 handle 2 matchall
		tc filter del dev $h1 egress protocol all pref 1 handle 1 flower
		tc qdisc del dev $h1 clsact
		tc filter del dev br0 egress protocol all pref 1 handle 1 matchall
		tc qdisc del dev br0 clsact
		}

		flooding_check_packets()