When creating a lot of listener sockets, it is enough to wait only for the last one, like we are doing before in diag.sh for other subtests.

If we do a check for each listener sockets, each time listing all available sockets, it can take a very long time in very slow environments, at the point we can reach some timeout.

When using the debug kconfig, the waiting time switches from more than 8 sec to 0.1 sec on my side. In slow/busy environments, and with a poll timeout set to 30 ms, the waiting time could go up to ~100 sec because the listener socket would timeout and stop, while the script would still be checking one by one if all sockets are ready. The result is that after having waited for everything to be ready, all sockets have been stopped due to a timeout, and it is too late for the script to check how many there were.

While at it, also removed ss options we don't need: we only need the filtering options, to count how many listener sockets have been created. We don't need to ask ss to display internal TCP information, and the memory if the output is dropped by the 'wc -l' command anyway.

Fixes: b4b51d36bbaa ("selftests: mptcp: explicitly trigger the listener diag code-path") Reported-by: Jakub Kicinski kuba@kernel.org Closes: https://lore.kernel.org/r/20240301063754.2ecefecf@kernel.org Signed-off-by: Matthieu Baerts (NGI0) matttbe@kernel.org --- Notes: - The 'Fixes' commit was will be in the future 6.8-rc6, but not marked to be backported. Because of that, the stable ML has not been added in Cc. --- tools/testing/selftests/net/mptcp/diag.sh | 9 +++------ 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/tools/testing/selftests/net/mptcp/diag.sh b/tools/testing/selftests/net/mptcp/diag.sh index 18d37d4695c1..75fc95675e2d 100755 --- a/tools/testing/selftests/net/mptcp/diag.sh +++ b/tools/testing/selftests/net/mptcp/diag.sh @@ -96,8 +96,8 @@ chk_listener_nr() local expected=$1 local msg="$2"

- __chk_nr "ss -inmlHMON $ns | wc -l" "$expected" "$msg - mptcp" 0 - __chk_nr "ss -inmlHtON $ns | wc -l" "$expected" "$msg - subflows" + __chk_nr "ss -nlHMON $ns | wc -l" "$expected" "$msg - mptcp" 0 + __chk_nr "ss -nlHtON $ns | wc -l" "$expected" "$msg - subflows" }

wait_msk_nr() @@ -304,10 +304,7 @@ for I in $(seq 1 $NR_SERVERS); do ip netns exec $ns ./mptcp_connect -p $((I + 20001)) \ -t ${timeout_poll} -l 0.0.0.0 >/dev/null 2>&1 & done - -for I in $(seq 1 $NR_SERVERS); do - mptcp_lib_wait_local_port_listen $ns $((I + 20001)) -done +mptcp_lib_wait_local_port_listen $ns $((NR_SERVERS + 20001))

chk_listener_nr $NR_SERVERS "many listener sockets"