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selftests: forwarding: add option to run tests with stable MAC addresses

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By default, DSA switch ports inherit their MAC address from the DSA
master.

This works well for practical situations, but some selftests like
bridge_vlan_unaware.sh loop back 2 standalone DSA ports with 2 bridged
DSA ports, and require the bridge to forward packets between the
standalone ports.

Due to the bridge seeing that the MAC DA it needs to forward is present
as a local FDB entry (it coincides with the MAC address of the bridge
ports), the test packets are not forwarded, but terminated locally on
br0. In turn, this makes the ping and ping6 tests fail.

Address this by introducing an option to have stable MAC addresses.
When mac_addr_prepare is called, the current addresses of the netifs are
saved and replaced with 00:01:02:03:04:${netif number}. Then when
mac_addr_restore is called at the end of the test, the original MAC
addresses are restored. This ensures that the MAC addresses are unique,
which makes the test pass even for DSA ports.

The usage model is for the behavior to be opt-in via STABLE_MAC_ADDRS,
which DSA should set to true, all others behave as before. By hooking
the calls to mac_addr_prepare and mac_addr_restore within the forwarding
lib itself, we do not need to patch each individual selftest, the only
requirement is that pre_cleanup is called.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vladimir Oltean 2022-04-22 13:14:57 +03:00 committed by David S. Miller
parent 988998ac4b
commit b343734ee2
1 changed files with 36 additions and 0 deletions
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36
tools/testing/selftests/net/forwarding/lib.sh
View file

@ -27,6 +27,7 @@ INTERFACE_TIMEOUT=${INTERFACE_TIMEOUT:=600}
LOW_AGEING_TIME=${LOW_AGEING_TIME:=1000}
REQUIRE_JQ=${REQUIRE_JQ:=yes}
REQUIRE_MZ=${REQUIRE_MZ:=yes}
STABLE_MAC_ADDRS=${STABLE_MAC_ADDRS:=no}
relative_path="${BASH_SOURCE%/*}"
if [[ "$relative_path" == "${BASH_SOURCE}" ]]; then
@ -214,10 +215,41 @@ create_netif()
esac
}
declare -A MAC_ADDR_ORIG
mac_addr_prepare()
{
local new_addr=
local dev=
for ((i = 1; i <= NUM_NETIFS; ++i)); do
dev=${NETIFS[p$i]}
new_addr=$(printf "00:01:02:03:04:%02x" $i)
MAC_ADDR_ORIG["$dev"]=$(ip -j link show dev $dev | jq -e '.[].address')
# Strip quotes
MAC_ADDR_ORIG["$dev"]=${MAC_ADDR_ORIG["$dev"]//\"/}
ip link set dev $dev address $new_addr
done
}
mac_addr_restore()
{
local dev=
for ((i = 1; i <= NUM_NETIFS; ++i)); do
dev=${NETIFS[p$i]}
ip link set dev $dev address ${MAC_ADDR_ORIG["$dev"]}
done
}
if [[ "$NETIF_CREATE" = "yes" ]]; then
create_netif
fi
if [[ "$STABLE_MAC_ADDRS" = "yes" ]]; then
mac_addr_prepare
fi
for ((i = 1; i <= NUM_NETIFS; ++i)); do
ip link show dev ${NETIFS[p$i]} &> /dev/null
if [[ $? -ne 0 ]]; then
@ -503,6 +535,10 @@ pre_cleanup()
echo "Pausing before cleanup, hit any key to continue"
read
fi
if [[ "$STABLE_MAC_ADDRS" = "yes" ]]; then
mac_addr_restore
fi
}
vrf_prepare()