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selftests: net: avoid just another constant wait

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Using hard-coded constant timeout to wait for some expected
event is deemed to fail sooner or later, especially in slow
env.

Our CI has spotted another of such race:
   # TEST: ipv6: cleanup of cached exceptions - nexthop objects          [FAIL]
   #   can't delete veth device in a timely manner, PMTU dst likely leaked

Replace the crude sleep with a loop looking for the expected condition
at low interval for a much longer range.

Fixes: b3cc4f8a8a ("selftests: pmtu: add explicit tests for PMTU exceptions cleanup")
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://lore.kernel.org/r/fd5c745e9bb665b724473af6a9373a8c2a62b247.1706812005.git.pabeni@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Paolo Abeni 2024-02-01 19:42:41 +01:00 committed by Jakub Kicinski
parent e71e016ad0
commit 691bb4e49c
1 changed files with 13 additions and 5 deletions
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18
tools/testing/selftests/net/pmtu.sh
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@ -1957,6 +1957,13 @@ check_command() {
return 0
}
check_running() {
pid=${1}
cmd=${2}
[ "$(cat /proc/${pid}/cmdline 2>/dev/null | tr -d '\0')" = "{cmd}" ]
}
test_cleanup_vxlanX_exception() {
outer="${1}"
encap="vxlan"
@ -1987,11 +1994,12 @@ test_cleanup_vxlanX_exception() {
${ns_a} ip link del dev veth_A-R1 &
iplink_pid=$!
sleep 1
if [ "$(cat /proc/${iplink_pid}/cmdline 2>/dev/null | tr -d '\0')" = "iplinkdeldevveth_A-R1" ]; then
err " can't delete veth device in a timely manner, PMTU dst likely leaked"
return 1
fi
for i in $(seq 1 20); do
check_running ${iplink_pid} "iplinkdeldevveth_A-R1" || return 0
sleep 0.1
done
err " can't delete veth device in a timely manner, PMTU dst likely leaked"
return 1
}
test_cleanup_ipv6_exception() {