[PATCH net-next v2 04/10] selftests: RED: Use defer for test cleanup

17 Oct 2024

Instead of having a suite of dedicated cleanup functions, use the defer
framework to schedule cleanups right as their setup functions are run.
The sleep after stop_traffic() in mlxsw selftests is necessary, but
scheduling it as "defer sleep; defer stop_traffic" is silly. Instead, add a
local helper to stop traffic and sleep afterwards.
Signed-off-by: Petr Machata petrm@nvidia.com
---
Notes:
    v2:
    - Defer stop_traffic including the sleep. The sleep is actually
      necessary and v1 was wrong in that it had the sleep prior to the
      stop_traffic invocation.
.../drivers/net/mlxsw/sch_red_core.sh         | 185 +++++++++---------
 .../drivers/net/mlxsw/sch_red_ets.sh          |  24 +--
 .../drivers/net/mlxsw/sch_red_root.sh         |  18 +-
 .../selftests/net/forwarding/sch_red.sh       | 103 ++++------
 4 files changed, 149 insertions(+), 181 deletions(-)

diff --git a/tools/testing/selftests/drivers/net/mlxsw/sch_red_core.sh b/tools/testing/selftests/drivers/net/mlxsw/sch_red_core.sh
index f4c324957dcc..537d6baa77b7 100644
--- a/tools/testing/selftests/drivers/net/mlxsw/sch_red_core.sh
+++ b/tools/testing/selftests/drivers/net/mlxsw/sch_red_core.sh
@@ -75,6 +75,18 @@ source $lib_dir/lib.sh
 source $lib_dir/devlink_lib.sh
 source mlxsw_lib.sh
+stop_traffic_sleep()
+{
+	local pid=$1; shift
+
+	# Issuing a kill still leaves a bunch of packets lingering in the
+	# buffers. This traffic then arrives at the point where a follow-up test
+	# is already running, and can confuse the test. Therefore sleep after
+	# stopping traffic to flush any leftover packets.
+	stop_traffic "$pid"
+	sleep 1
+}
+
 ipaddr()
 {
    local host=$1; shift
@@ -89,39 +101,31 @@ host_create()
    local host=$1; shift
simple_if_init $dev
+	defer simple_if_fini $dev
+
    mtu_set $dev 10000
+	defer mtu_restore $dev
vlan_create $dev 10 v$dev $(ipaddr $host 10)/28
+	defer vlan_destroy $dev 10
    ip link set dev $dev.10 type vlan egress 0:0
vlan_create $dev 11 v$dev $(ipaddr $host 11)/28
+	defer vlan_destroy $dev 11
    ip link set dev $dev.11 type vlan egress 0:1
 }
-host_destroy()
-{
-	local dev=$1; shift
-
-	vlan_destroy $dev 11
-	vlan_destroy $dev 10
-	mtu_restore $dev
-	simple_if_fini $dev
-}
-
 h1_create()
 {
    host_create $h1 1
 }
-h1_destroy()
-{
-	host_destroy $h1
-}
-
 h2_create()
 {
    host_create $h2 2
+
    tc qdisc add dev $h2 clsact
+	defer tc qdisc del dev $h2 clsact
# Some of the tests in this suite use multicast traffic. As this traffic
    # enters BR2_10 resp. BR2_11, it is flooded to all other ports. Thus
@@ -139,13 +143,7 @@ h2_create()
tc qdisc replace dev $h2 root handle 10: tbf rate 200mbit \
    	burst 128K limit 1G
-}
-
-h2_destroy()
-{
-	tc qdisc del dev $h2 root handle 10:
-	tc qdisc del dev $h2 clsact
-	host_destroy $h2
+	defer tc qdisc del dev $h2 root handle 10:
 }
h3_create()
@@ -153,40 +151,54 @@ h3_create()
    host_create $h3 3
 }
-h3_destroy()
-{
-	host_destroy $h3
-}
-
 switch_create()
 {
    local intf
    local vlan
ip link add dev br1_10 type bridge
+	defer ip link del dev br1_10
+
    ip link add dev br1_11 type bridge
+	defer ip link del dev br1_11
ip link add dev br2_10 type bridge
+	defer ip link del dev br2_10
+
    ip link add dev br2_11 type bridge
+	defer ip link del dev br2_11
for intf in $swp1 $swp2 $swp3 $swp4 $swp5; do
    	ip link set dev $intf up
+		defer ip link set dev $intf down
+
    	mtu_set $intf 10000
+		defer mtu_restore $intf
    done
for intf in $swp1 $swp4; do
    	for vlan in 10 11; do
    		vlan_create $intf $vlan
+			defer vlan_destroy $intf $vlan
+
    		ip link set dev $intf.$vlan master br1_$vlan
+			defer ip link set dev $intf.$vlan nomaster
+
    		ip link set dev $intf.$vlan up
+			defer ip link set dev $intf.$vlan up
    	done
    done
for intf in $swp2 $swp3 $swp5; do
    	for vlan in 10 11; do
    		vlan_create $intf $vlan
+			defer vlan_destroy $intf $vlan
+
    		ip link set dev $intf.$vlan master br2_$vlan
+			defer ip link set dev $intf.$vlan nomaster
+
    		ip link set dev $intf.$vlan up
+			defer ip link set dev $intf.$vlan up
    	done
    done
@@ -201,49 +213,25 @@ switch_create()
    for intf in $swp3 $swp4; do
    	tc qdisc replace dev $intf root handle 1: tbf rate 200mbit \
    		burst 128K limit 1G
+		defer tc qdisc del dev $intf root handle 1:
    done
ip link set dev br1_10 up
+	defer ip link set dev br1_10 down
+
    ip link set dev br1_11 up
+	defer ip link set dev br1_11 down
+
    ip link set dev br2_10 up
+	defer ip link set dev br2_10 down
+
    ip link set dev br2_11 up
+	defer ip link set dev br2_11 down
local size=$(devlink_pool_size_thtype 0 | cut -d' ' -f 1)
    devlink_port_pool_th_save $swp3 8
    devlink_port_pool_th_set $swp3 8 $size
-}
-
-switch_destroy()
-{
-	local intf
-	local vlan
-
-	devlink_port_pool_th_restore $swp3 8
-
-	ip link set dev br2_11 down
-	ip link set dev br2_10 down
-	ip link set dev br1_11 down
-	ip link set dev br1_10 down
-
-	for intf in $swp4 $swp3; do
-		tc qdisc del dev $intf root handle 1:
-	done
-
-	for intf in $swp5 $swp3 $swp2 $swp4 $swp1; do
-		for vlan in 11 10; do
-			ip link set dev $intf.$vlan down
-			ip link set dev $intf.$vlan nomaster
-			vlan_destroy $intf $vlan
-		done
-
-		mtu_restore $intf
-		ip link set dev $intf down
-	done
-
-	ip link del dev br2_11
-	ip link del dev br2_10
-	ip link del dev br1_11
-	ip link del dev br1_10
+	defer devlink_port_pool_th_restore $swp3 8
 }
setup_prepare()
@@ -263,6 +251,7 @@ setup_prepare()
    h3_mac=$(mac_get $h3)
vrf_prepare
+	defer vrf_cleanup
h1_create
    h2_create
@@ -270,18 +259,6 @@ setup_prepare()
    switch_create
 }
-cleanup()
-{
-	pre_cleanup
-
-	switch_destroy
-	h3_destroy
-	h2_destroy
-	h1_destroy
-
-	vrf_cleanup
-}
-
 ping_ipv4()
 {
    ping_test $h1.10 $(ipaddr 3 10) " from host 1, vlan 10"
@@ -450,6 +427,7 @@ __do_ecn_test()
start_tcp_traffic $h1.$vlan $(ipaddr 1 $vlan) $(ipaddr 3 $vlan) \
    		  $h3_mac tos=0x01
+	defer stop_traffic_sleep $!
    sleep 1
ecn_test_common "$name" "$get_nmarked" $vlan $limit
@@ -461,9 +439,6 @@ __do_ecn_test()
    build_backlog $vlan $((2 * limit)) udp >/dev/null
    check_fail $? "UDP traffic went into backlog instead of being early-dropped"
    log_test "TC $((vlan - 10)): $name backlog > limit: UDP early-dropped"
-
-	stop_traffic
-	sleep 1
 }
do_ecn_test()
@@ -471,7 +446,8 @@ do_ecn_test()
    local vlan=$1; shift
    local limit=$1; shift
-	__do_ecn_test get_nmarked "$vlan" "$limit"
+	in_defer_scope \
+		__do_ecn_test get_nmarked "$vlan" "$limit"
 }
do_ecn_test_perband()
@@ -480,10 +456,11 @@ do_ecn_test_perband()
    local limit=$1; shift
mlxsw_only_on_spectrum 3+ || return
-	__do_ecn_test get_qdisc_nmarked "$vlan" "$limit" "per-band ECN"
+	in_defer_scope \
+		__do_ecn_test get_qdisc_nmarked "$vlan" "$limit" "per-band ECN"
 }
-do_ecn_nodrop_test()
+__do_ecn_nodrop_test()
 {
    local vlan=$1; shift
    local limit=$1; shift
@@ -491,6 +468,7 @@ do_ecn_nodrop_test()
start_tcp_traffic $h1.$vlan $(ipaddr 1 $vlan) $(ipaddr 3 $vlan) \
    		  $h3_mac tos=0x01
+	defer stop_traffic_sleep $!
    sleep 1
ecn_test_common "$name" get_nmarked $vlan $limit
@@ -502,12 +480,15 @@ do_ecn_nodrop_test()
    build_backlog $vlan $((2 * limit)) udp >/dev/null
    check_err $? "UDP traffic was early-dropped instead of getting into backlog"
    log_test "TC $((vlan - 10)): $name backlog > limit: UDP not dropped"
+}
-	stop_traffic
-	sleep 1
+do_ecn_nodrop_test()
+{
+	in_defer_scope \
+		__do_ecn_nodrop_test "$@"
 }
-do_red_test()
+__do_red_test()
 {
    local vlan=$1; shift
    local limit=$1; shift
@@ -518,6 +499,7 @@ do_red_test()
    # is above limit.
    start_tcp_traffic $h1.$vlan $(ipaddr 1 $vlan) $(ipaddr 3 $vlan) \
    		  $h3_mac tos=0x01
+	defer stop_traffic_sleep $!
# Pushing below the queue limit should work.
    RET=0
@@ -539,12 +521,15 @@ do_red_test()
    ((-15 <= pct && pct <= 15))
    check_err $? "backlog $backlog / $limit expected <= 15% distance"
    log_test "TC $((vlan - 10)): RED backlog > limit"
+}
-	stop_traffic
-	sleep 1
+do_red_test()
+{
+	in_defer_scope \
+		__do_red_test "$@"
 }
-do_mc_backlog_test()
+__do_mc_backlog_test()
 {
    local vlan=$1; shift
    local limit=$1; shift
@@ -554,7 +539,10 @@ do_mc_backlog_test()
    RET=0
start_tcp_traffic $h1.$vlan $(ipaddr 1 $vlan) $(ipaddr 3 $vlan) bc
+	defer stop_traffic_sleep $!
+
    start_tcp_traffic $h2.$vlan $(ipaddr 2 $vlan) $(ipaddr 3 $vlan) bc
+	defer stop_traffic_sleep $!
qbl=$(busywait 5000 until_counter_is ">= 500000" \
    	       get_qdisc_backlog $vlan)
@@ -567,13 +555,16 @@ do_mc_backlog_test()
    	       get_mc_transmit_queue $vlan)
    check_err $? "MC backlog reported by qdisc not visible in ethtool"
-	stop_traffic
-	stop_traffic
-
    log_test "TC $((vlan - 10)): Qdisc reports MC backlog"
 }
-do_mark_test()
+do_mc_backlog_test()
+{
+	in_defer_scope \
+		__do_mc_backlog_test "$@"
+}
+
+__do_mark_test()
 {
    local vlan=$1; shift
    local limit=$1; shift
@@ -588,6 +579,7 @@ do_mark_test()
start_tcp_traffic $h1.$vlan $(ipaddr 1 $vlan) $(ipaddr 3 $vlan) \
    		  $h3_mac tos=0x01
+	defer stop_traffic_sleep $!
# Create a bit of a backlog and observe no mirroring due to marks.
    qevent_rule_install_$subtest
@@ -617,12 +609,15 @@ do_mark_test()
    else
    	log_test "TC $((vlan - 10)): marked packets $subtest'd"
    fi
+}
-	stop_traffic
-	sleep 1
+do_mark_test()
+{
+	in_defer_scope \
+		__do_mark_test "$@"
 }
-do_drop_test()
+__do_drop_test()
 {
    local vlan=$1; shift
    local limit=$1; shift
@@ -637,6 +632,7 @@ do_drop_test()
    RET=0
start_traffic $h1.$vlan $(ipaddr 1 $vlan) $(ipaddr 3 $vlan) $h3_mac
+	defer stop_traffic_sleep $!
# Create a bit of a backlog and observe no mirroring due to drops.
    qevent_rule_install_$subtest
@@ -671,9 +667,12 @@ do_drop_test()
    check_fail $? "$((now - base)) spurious packets observed after uninstall"
log_test "TC $((vlan - 10)): ${trigger}ped packets $subtest'd"
+}
-	stop_traffic
-	sleep 1
+do_drop_test()
+{
+	in_defer_scope \
+		__do_drop_test "$@"
 }
qevent_rule_install_mirror()
diff --git a/tools/testing/selftests/drivers/net/mlxsw/sch_red_ets.sh b/tools/testing/selftests/drivers/net/mlxsw/sch_red_ets.sh
index 576067b207a8..8902a115d9cd 100755
--- a/tools/testing/selftests/drivers/net/mlxsw/sch_red_ets.sh
+++ b/tools/testing/selftests/drivers/net/mlxsw/sch_red_ets.sh
@@ -80,36 +80,34 @@ uninstall_qdisc()
 ecn_test()
 {
    install_qdisc ecn
+	defer uninstall_qdisc
do_ecn_test 10 $BACKLOG1
    do_ecn_test 11 $BACKLOG2
-
-	uninstall_qdisc
 }
ecn_test_perband()
 {
    install_qdisc ecn
+	defer uninstall_qdisc
do_ecn_test_perband 10 $BACKLOG1
    do_ecn_test_perband 11 $BACKLOG2
-
-	uninstall_qdisc
 }
ecn_nodrop_test()
 {
    install_qdisc ecn nodrop
+	defer uninstall_qdisc
do_ecn_nodrop_test 10 $BACKLOG1
    do_ecn_nodrop_test 11 $BACKLOG2
-
-	uninstall_qdisc
 }
red_test()
 {
    install_qdisc
+	defer uninstall_qdisc
# Make sure that we get the non-zero value if there is any.
    local cur=$(busywait 1100 until_counter_is "> 0" \
@@ -120,50 +118,44 @@ red_test()
do_red_test 10 $BACKLOG1
    do_red_test 11 $BACKLOG2
-
-	uninstall_qdisc
 }
mc_backlog_test()
 {
    install_qdisc
+	defer uninstall_qdisc
# Note that the backlog numbers here do not correspond to RED
    # configuration, but are arbitrary.
    do_mc_backlog_test 10 $BACKLOG1
    do_mc_backlog_test 11 $BACKLOG2
-
-	uninstall_qdisc
 }
red_mirror_test()
 {
    install_qdisc qevent early_drop block 10
+	defer uninstall_qdisc
do_drop_mirror_test 10 $BACKLOG1 early_drop
    do_drop_mirror_test 11 $BACKLOG2 early_drop
-
-	uninstall_qdisc
 }
red_trap_test()
 {
    install_qdisc qevent early_drop block 10
+	defer uninstall_qdisc
do_drop_trap_test 10 $BACKLOG1 early_drop
    do_drop_trap_test 11 $BACKLOG2 early_drop
-
-	uninstall_qdisc
 }
ecn_mirror_test()
 {
    install_qdisc ecn qevent mark block 10
+	defer uninstall_qdisc
do_mark_mirror_test 10 $BACKLOG1
    do_mark_mirror_test 11 $BACKLOG2
-
-	uninstall_qdisc
 }
bail_on_lldpad "configure DCB" "configure Qdiscs"
diff --git a/tools/testing/selftests/drivers/net/mlxsw/sch_red_root.sh b/tools/testing/selftests/drivers/net/mlxsw/sch_red_root.sh
index 159108d02895..e9043771787b 100755
--- a/tools/testing/selftests/drivers/net/mlxsw/sch_red_root.sh
+++ b/tools/testing/selftests/drivers/net/mlxsw/sch_red_root.sh
@@ -32,45 +32,51 @@ uninstall_qdisc()
 ecn_test()
 {
    install_qdisc ecn
+	defer uninstall_qdisc
+
    do_ecn_test 10 $BACKLOG
-	uninstall_qdisc
 }
ecn_test_perband()
 {
    install_qdisc ecn
+	defer uninstall_qdisc
+
    do_ecn_test_perband 10 $BACKLOG
-	uninstall_qdisc
 }
ecn_nodrop_test()
 {
    install_qdisc ecn nodrop
+	defer uninstall_qdisc
+
    do_ecn_nodrop_test 10 $BACKLOG
-	uninstall_qdisc
 }
red_test()
 {
    install_qdisc
+	defer uninstall_qdisc
+
    do_red_test 10 $BACKLOG
-	uninstall_qdisc
 }
mc_backlog_test()
 {
    install_qdisc
+	defer uninstall_qdisc
+
    # Note that the backlog value here does not correspond to RED
    # configuration, but is arbitrary.
    do_mc_backlog_test 10 $BACKLOG
-	uninstall_qdisc
 }
red_mirror_test()
 {
    install_qdisc qevent early_drop block 10
+	defer uninstall_qdisc
+
    do_drop_mirror_test 10 $BACKLOG
-	uninstall_qdisc
 }
bail_on_lldpad "configure DCB" "configure Qdiscs"
diff --git a/tools/testing/selftests/net/forwarding/sch_red.sh b/tools/testing/selftests/net/forwarding/sch_red.sh
index 17f28644568e..af166662b78a 100755
--- a/tools/testing/selftests/net/forwarding/sch_red.sh
+++ b/tools/testing/selftests/net/forwarding/sch_red.sh
@@ -53,71 +53,63 @@ PKTSZ=1400
 h1_create()
 {
    simple_if_init $h1 192.0.2.1/28
+	defer simple_if_fini $h1 192.0.2.1/28
+
    mtu_set $h1 10000
+	defer mtu_restore $h1
+
    tc qdisc replace dev $h1 root handle 1: tbf \
       rate 10Mbit burst 10K limit 1M
-}
-
-h1_destroy()
-{
-	tc qdisc del dev $h1 root
-	mtu_restore $h1
-	simple_if_fini $h1 192.0.2.1/28
+	defer tc qdisc del dev $h1 root
 }
h2_create()
 {
    simple_if_init $h2 192.0.2.2/28
+	defer simple_if_fini $h2 192.0.2.2/28
+
    mtu_set $h2 10000
-}
-
-h2_destroy()
-{
-	mtu_restore $h2
-	simple_if_fini $h2 192.0.2.2/28
+	defer mtu_restore $h2
 }
h3_create()
 {
    simple_if_init $h3 192.0.2.3/28
+	defer simple_if_fini $h3 192.0.2.3/28
+
    mtu_set $h3 10000
-}
-
-h3_destroy()
-{
-	mtu_restore $h3
-	simple_if_fini $h3 192.0.2.3/28
+	defer mtu_restore $h3
 }
switch_create()
 {
    ip link add dev br up type bridge
+	defer ip link del dev br
+
    ip link set dev $swp1 up master br
+	defer ip link set dev $swp1 down nomaster
+
    ip link set dev $swp2 up master br
+	defer ip link set dev $swp2 down nomaster
+
    ip link set dev $swp3 up master br
+	defer ip link set dev $swp3 down nomaster
mtu_set $swp1 10000
+	defer mtu_restore $h1
+
    mtu_set $swp2 10000
+	defer mtu_restore $h2
+
    mtu_set $swp3 10000
+	defer mtu_restore $h3
tc qdisc replace dev $swp3 root handle 1: tbf \
       rate 10Mbit burst 10K limit 1M
+	defer tc qdisc del dev $swp3 root
+
    ip link add name _drop_test up type dummy
-}
-
-switch_destroy()
-{
-	ip link del dev _drop_test
-	tc qdisc del dev $swp3 root
-
-	mtu_restore $h3
-	mtu_restore $h2
-	mtu_restore $h1
-
-	ip link set dev $swp3 down nomaster
-	ip link set dev $swp2 down nomaster
-	ip link set dev $swp1 down nomaster
-	ip link del dev br
+	defer ip link del dev _drop_test
 }
setup_prepare()
@@ -134,6 +126,7 @@ setup_prepare()
    h3_mac=$(mac_get $h3)
vrf_prepare
+	defer vrf_cleanup
h1_create
    h2_create
@@ -141,18 +134,6 @@ setup_prepare()
    switch_create
 }
-cleanup()
-{
-	pre_cleanup
-
-	switch_destroy
-	h3_destroy
-	h2_destroy
-	h1_destroy
-
-	vrf_cleanup
-}
-
 ping_ipv4()
 {
    ping_test $h1 192.0.2.3 " from host 1"
@@ -287,6 +268,7 @@ do_ecn_test()
$MZ $h1 -p $PKTSZ -A 192.0.2.1 -B 192.0.2.3 -c 0 \
    	-a own -b $h3_mac -t tcp -q tos=0x01 &
+	defer stop_traffic $!
    sleep 1
ecn_test_common "$name" $limit
@@ -298,9 +280,6 @@ do_ecn_test()
    build_backlog $((2 * limit)) udp >/dev/null
    check_fail $? "UDP traffic went into backlog instead of being early-dropped"
    log_test "$name backlog > limit: UDP early-dropped"
-
-	stop_traffic
-	sleep 1
 }
do_ecn_nodrop_test()
@@ -310,6 +289,7 @@ do_ecn_nodrop_test()
$MZ $h1 -p $PKTSZ -A 192.0.2.1 -B 192.0.2.3 -c 0 \
    	-a own -b $h3_mac -t tcp -q tos=0x01 &
+	defer stop_traffic $!
    sleep 1
ecn_test_common "$name" $limit
@@ -321,9 +301,6 @@ do_ecn_nodrop_test()
    build_backlog $((2 * limit)) udp >/dev/null
    check_err $? "UDP traffic was early-dropped instead of getting into backlog"
    log_test "$name backlog > limit: UDP not dropped"
-
-	stop_traffic
-	sleep 1
 }
do_red_test()
@@ -336,6 +313,7 @@ do_red_test()
    # is above limit.
    $MZ $h1 -p $PKTSZ -A 192.0.2.1 -B 192.0.2.3 -c 0 \
    	-a own -b $h3_mac -t tcp -q tos=0x01 &
+	defer stop_traffic $!
# Pushing below the queue limit should work.
    RET=0
@@ -352,9 +330,6 @@ do_red_test()
    pct=$(check_marking "== 0")
    check_err $? "backlog $backlog / $limit Got $pct% marked packets, expected == 0."
    log_test "RED backlog > limit"
-
-	stop_traffic
-	sleep 1
 }
do_red_qevent_test()
@@ -369,6 +344,7 @@ do_red_qevent_test()
$MZ $h1 -p $PKTSZ -A 192.0.2.1 -B 192.0.2.3 -c 0 \
    	-a own -b $h3_mac -t udp -q &
+	defer stop_traffic $!
    sleep 1
tc filter add block 10 pref 1234 handle 102 matchall skip_hw \
@@ -396,9 +372,6 @@ do_red_qevent_test()
    check_err $? "Dropped packets still observed: 0 expected, $((now - base)) seen"
log_test "RED early_dropped packets mirrored"
-
-	stop_traffic
-	sleep 1
 }
do_ecn_qevent_test()
@@ -410,6 +383,7 @@ do_ecn_qevent_test()
$MZ $h1 -p $PKTSZ -A 192.0.2.1 -B 192.0.2.3 -c 0 \
    	-a own -b $h3_mac -t tcp -q tos=0x01 &
+	defer stop_traffic $!
    sleep 1
tc filter add block 10 pref 1234 handle 102 matchall skip_hw \
@@ -428,9 +402,6 @@ do_ecn_qevent_test()
    tc filter del block 10 pref 1234 handle 102 matchall
log_test "ECN marked packets mirrored"
-
-	stop_traffic
-	sleep 1
 }
install_qdisc()
@@ -451,36 +422,36 @@ uninstall_qdisc()
 ecn_test()
 {
    install_qdisc ecn
+	defer uninstall_qdisc
    xfail_on_slow do_ecn_test $BACKLOG
-	uninstall_qdisc
 }
ecn_nodrop_test()
 {
    install_qdisc ecn nodrop
+	defer uninstall_qdisc
    xfail_on_slow do_ecn_nodrop_test $BACKLOG
-	uninstall_qdisc
 }
red_test()
 {
    install_qdisc
+	defer uninstall_qdisc
    xfail_on_slow do_red_test $BACKLOG
-	uninstall_qdisc
 }
red_qevent_test()
 {
    install_qdisc qevent early_drop block 10
+	defer uninstall_qdisc
    xfail_on_slow do_red_qevent_test $BACKLOG
-	uninstall_qdisc
 }
ecn_qevent_test()
 {
    install_qdisc ecn qevent mark block 10
+	defer uninstall_qdisc
    xfail_on_slow do_ecn_qevent_test $BACKLOG
-	uninstall_qdisc
 }
trap cleanup EXIT
-- 
2.45.0



    

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[PATCH net-next v2 04/10] selftests: RED: Use defer for test cleanup