[PATCH bpf 3/7] selftests/bpf/test_xdp_vlan: use temp netns for testing

Hangbin Liu
2022-01-25T09:07:12Z

Use temp netns instead of hard code name for testing in case the
netns already exists.

Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
---
tools/testing/selftests/bpf/test_xdp_vlan.sh | 66 ++++++++++----------
1 file changed, 34 insertions(+), 32 deletions(-)

diff --git a/tools/testing/selftests/bpf/test_xdp_vlan.sh b/tools/testing/selftests/bpf/test_xdp_vlan.sh
index 0cbc7604a2f8..810c407e0286 100755
--- a/tools/testing/selftests/bpf/test_xdp_vlan.sh
+++ b/tools/testing/selftests/bpf/test_xdp_vlan.sh
@@ -4,6 +4,8 @@

# Kselftest framework requirement - SKIP code is 4.
readonly KSFT_SKIP=4
+readonly NS1="ns1-$(mktemp -u XXXXXX)"
+readonly NS2="ns2-$(mktemp -u XXXXXX)"

# Allow wrapper scripts to name test
if [ -z "$TESTNAME" ]; then
@@ -49,15 +51,15 @@ cleanup()

if [ -n "$INTERACTIVE" ]; then
echo "Namespace setup still active explore with:"
- echo " ip netns exec ns1 bash"
- echo " ip netns exec ns2 bash"
+ echo " ip netns exec ${NS1} bash"
+ echo " ip netns exec ${NS2} bash"
exit $status
fi

set +e
ip link del veth1 2> /dev/null
- ip netns del ns1 2> /dev/null
- ip netns del ns2 2> /dev/null
+ ip netns del ${NS1} 2> /dev/null
+ ip netns del ${NS2} 2> /dev/null
}

# Using external program "getopt" to get --long-options
@@ -126,8 +128,8 @@ fi
# Interactive mode likely require us to cleanup netns
if [ -n "$INTERACTIVE" ]; then
ip link del veth1 2> /dev/null
- ip netns del ns1 2> /dev/null
- ip netns del ns2 2> /dev/null
+ ip netns del ${NS1} 2> /dev/null
+ ip netns del ${NS2} 2> /dev/null
fi

# Exit on failure
@@ -144,8 +146,8 @@ if [ -n "$VERBOSE" ]; then
fi

# Create two namespaces
-ip netns add ns1
-ip netns add ns2
+ip netns add ${NS1}
+ip netns add ${NS2}

# Run cleanup if failing or on kill
trap cleanup 0 2 3 6 9
@@ -154,44 +156,44 @@ trap cleanup 0 2 3 6 9
ip link add veth1 type veth peer name veth2

# Move veth1 and veth2 into the respective namespaces
-ip link set veth1 netns ns1
-ip link set veth2 netns ns2
+ip link set veth1 netns ${NS1}
+ip link set veth2 netns ${NS2}

# NOTICE: XDP require VLAN header inside packet payload
# - Thus, disable VLAN offloading driver features
# - For veth REMEMBER TX side VLAN-offload
#
# Disable rx-vlan-offload (mostly needed on ns1)
-ip netns exec ns1 ethtool -K veth1 rxvlan off
-ip netns exec ns2 ethtool -K veth2 rxvlan off
+ip netns exec ${NS1} ethtool -K veth1 rxvlan off
+ip netns exec ${NS2} ethtool -K veth2 rxvlan off
#
# Disable tx-vlan-offload (mostly needed on ns2)
-ip netns exec ns2 ethtool -K veth2 txvlan off
-ip netns exec ns1 ethtool -K veth1 txvlan off
+ip netns exec ${NS2} ethtool -K veth2 txvlan off
+ip netns exec ${NS1} ethtool -K veth1 txvlan off

export IPADDR1=100.64.41.1
export IPADDR2=100.64.41.2

# In ns1/veth1 add IP-addr on plain net_device
-ip netns exec ns1 ip addr add ${IPADDR1}/24 dev veth1
-ip netns exec ns1 ip link set veth1 up
+ip netns exec ${NS1} ip addr add ${IPADDR1}/24 dev veth1
+ip netns exec ${NS1} ip link set veth1 up

# In ns2/veth2 create VLAN device
export VLAN=4011
export DEVNS2=veth2
-ip netns exec ns2 ip link add link $DEVNS2 name $DEVNS2.$VLAN type vlan id $VLAN
-ip netns exec ns2 ip addr add ${IPADDR2}/24 dev $DEVNS2.$VLAN
-ip netns exec ns2 ip link set $DEVNS2 up
-ip netns exec ns2 ip link set $DEVNS2.$VLAN up
+ip netns exec ${NS2} ip link add link $DEVNS2 name $DEVNS2.$VLAN type vlan id $VLAN
+ip netns exec ${NS2} ip addr add ${IPADDR2}/24 dev $DEVNS2.$VLAN
+ip netns exec ${NS2} ip link set $DEVNS2 up
+ip netns exec ${NS2} ip link set $DEVNS2.$VLAN up

# Bringup lo in netns (to avoids confusing people using --interactive)
-ip netns exec ns1 ip link set lo up
-ip netns exec ns2 ip link set lo up
+ip netns exec ${NS1} ip link set lo up
+ip netns exec ${NS2} ip link set lo up

# At this point, the hosts cannot reach each-other,
# because ns2 are using VLAN tags on the packets.

-ip netns exec ns2 sh -c 'ping -W 1 -c 1 100.64.41.1 || echo "Success: First ping must fail"'
+ip netns exec ${NS2} sh -c 'ping -W 1 -c 1 100.64.41.1 || echo "Success: First ping must fail"'

# Now we can use the test_xdp_vlan.c program to pop/push these VLAN tags
@@ -202,19 +204,19 @@ export FILE=test_xdp_vlan.o

# First test: Remove VLAN by setting VLAN ID 0, using "xdp_vlan_change"
export XDP_PROG=xdp_vlan_change
-ip netns exec ns1 ip link set $DEVNS1 $XDP_MODE object $FILE section $XDP_PROG
+ip netns exec ${NS1} ip link set $DEVNS1 $XDP_MODE object $FILE section $XDP_PROG

# In ns1: egress use TC to add back VLAN tag 4011
# (del cmd)
# tc qdisc del dev $DEVNS1 clsact 2> /dev/null
#
-ip netns exec ns1 tc qdisc add dev $DEVNS1 clsact
-ip netns exec ns1 tc filter add dev $DEVNS1 egress \
+ip netns exec ${NS1} tc qdisc add dev $DEVNS1 clsact
+ip netns exec ${NS1} tc filter add dev $DEVNS1 egress \
prio 1 handle 1 bpf da obj $FILE sec tc_vlan_push

# Now the namespaces can reach each-other, test with ping:
-ip netns exec ns2 ping -i 0.2 -W 2 -c 2 $IPADDR1
-ip netns exec ns1 ping -i 0.2 -W 2 -c 2 $IPADDR2
+ip netns exec ${NS2} ping -i 0.2 -W 2 -c 2 $IPADDR1
+ip netns exec ${NS1} ping -i 0.2 -W 2 -c 2 $IPADDR2

# Second test: Replace xdp prog, that fully remove vlan header
#
@@ -223,9 +225,9 @@ ip netns exec ns1 ping -i 0.2 -W 2 -c 2 $IPADDR2
# ETH_P_8021Q indication, and this cause overwriting of our changes.
#
export XDP_PROG=xdp_vlan_remove_outer2
-ip netns exec ns1 ip link set $DEVNS1 $XDP_MODE off
-ip netns exec ns1 ip link set $DEVNS1 $XDP_MODE object $FILE section $XDP_PROG
+ip netns exec ${NS1} ip link set $DEVNS1 $XDP_MODE off
+ip netns exec ${NS1} ip link set $DEVNS1 $XDP_MODE object $FILE section $XDP_PROG

# Now the namespaces should still be able reach each-other, test with ping:
-ip netns exec ns2 ping -i 0.2 -W 2 -c 2 $IPADDR1
-ip netns exec ns1 ping -i 0.2 -W 2 -c 2 $IPADDR2
+ip netns exec ${NS2} ping -i 0.2 -W 2 -c 2 $IPADDR1
+ip netns exec ${NS1} ping -i 0.2 -W 2 -c 2 $IPADDR2
--
2.31.1