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selftests: openvswitch: retry instead of sleep

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There are a couple of places where the test script "sleep"s to wait for
some external condition to be met.

This is error prone, specially in slow systems (identified in CI by
"KSFT_MACHINE_SLOW=yes").

To fix this, add a "ovs_wait" function that tries to execute a command
a few times until it succeeds. The timeout used is set to 5s for
"normal" systems and doubled if a slow CI machine is detected.

This should make the following work:

$ vng --build  \
    --config tools/testing/selftests/net/config \
    --config kernel/configs/debug.config

$ vng --run . --user root -- "make -C tools/testing/selftests/ \
    KSFT_MACHINE_SLOW=yes TARGETS=net/openvswitch run_tests"

Signed-off-by: Adrian Moreno <amorenoz@redhat.com>
Reviewed-by: Ilya Maximets <i.maximets@ovn.org>
Link: https://patch.msgid.link/20240710090500.1655212-1-amorenoz@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Adrian Moreno 2024-07-10 11:04:59 +02:00 committed by Jakub Kicinski
parent 13cabc47f8
commit 5e724cb688
2 changed files with 38 additions and 8 deletions
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45
tools/testing/selftests/net/openvswitch/openvswitch.sh
View file

@ -11,6 +11,11 @@ ksft_skip=4
PAUSE_ON_FAIL=no
VERBOSE=0
TRACING=0
WAIT_TIMEOUT=5
if test "X$KSFT_MACHINE_SLOW" == "Xyes"; then
WAIT_TIMEOUT=10
fi
tests="
arp_ping eth-arp: Basic arp ping between two NS
@ -29,6 +34,30 @@ info() {
[ $VERBOSE = 0 ] || echo $*
}
ovs_wait() {
info "waiting $WAIT_TIMEOUT s for: $@"
if "$@" ; then
info "wait succeeded immediately"
return 0
fi
# A quick re-check helps speed up small races in fast systems.
# However, fractional sleeps might not necessarily work.
local start=0
sleep 0.1 || { sleep 1; start=1; }
for (( i=start; i<WAIT_TIMEOUT; i++ )); do
if "$@" ; then
info "wait succeeded after $i seconds"
return 0
fi
sleep 1
done
info "wait failed after $i seconds"
return 1
}
ovs_base=`pwd`
sbxs=
sbx_add () {
@ -278,20 +307,19 @@ test_psample() {
# Record psample data.
ovs_spawn_daemon "test_psample" python3 $ovs_base/ovs-dpctl.py psample-events
ovs_wait grep -q "listening for psample events" ${ovs_dir}/stdout
# Send a single ping.
sleep 1
ovs_sbx "test_psample" ip netns exec client ping -I c1 172.31.110.20 -c 1 || return 1
sleep 1
# We should have received one userspace action upcall and 2 psample packets.
grep -E "userspace action command" $ovs_dir/s0.out >/dev/null 2>&1 || return 1
ovs_wait grep -q "userspace action command" $ovs_dir/s0.out || return 1
# client -> server samples should only contain the first 14 bytes of the packet.
grep -E "rate:4294967295,group:1,cookie:c0ffee data:[0-9a-f]{28}$" \
$ovs_dir/stdout >/dev/null 2>&1 || return 1
grep -E "rate:4294967295,group:2,cookie:eeff0c" \
$ovs_dir/stdout >/dev/null 2>&1 || return 1
ovs_wait grep -qE "rate:4294967295,group:1,cookie:c0ffee data:[0-9a-f]{28}$" \
$ovs_dir/stdout || return 1
ovs_wait grep -q "rate:4294967295,group:2,cookie:eeff0c" $ovs_dir/stdout || return 1
return 0
}
@ -711,7 +739,8 @@ test_upcall_interfaces() {
ovs_add_netns_and_veths "test_upcall_interfaces" ui0 upc left0 l0 \
172.31.110.1/24 -u || return 1
sleep 1
ovs_wait grep -q "listening on upcall packet handler" ${ovs_dir}/left0.out
info "sending arping"
ip netns exec upc arping -I l0 172.31.110.20 -c 1 \
>$ovs_dir/arping.stdout 2>$ovs_dir/arping.stderr

1
tools/testing/selftests/net/openvswitch/ovs-dpctl.py
View file

@ -2520,6 +2520,7 @@ class PsampleEvent(EventSocket):
marshal_class = psample_msg
def read_samples(self):
print("listening for psample events", flush=True)
while True:
try:
for msg in self.get():