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selftests: mptcp: explicitly trigger the listener diag code-path

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The mptcp diag interface already experienced a few locking bugs
that lockdep and appropriate coverage have detected in advance.

Let's add a test-case triggering the relevant code path, to prevent
similar issues in the future.

Be careful to cope with very slow environments.

Note that we don't need an explicit timeout on the mptcp_connect
subprocess to cope with eventual bug/hang-up as the final cleanup
terminating the child processes will take care of that.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/r/20240223-upstream-net-20240223-misc-fixes-v1-10-162e87e48497@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Paolo Abeni 2024-02-23 17:14:20 +01:00 committed by Jakub Kicinski
parent d6a9608af9
commit b4b51d36bb
1 changed files with 29 additions and 1 deletions
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30
tools/testing/selftests/net/mptcp/diag.sh
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@ -20,7 +20,7 @@ flush_pids()
ip netns pids "${ns}" | xargs --no-run-if-empty kill -SIGUSR1 &>/dev/null
for _ in $(seq 10); do
for _ in $(seq $((timeout_poll * 10))); do
[ -z "$(ip netns pids "${ns}")" ] && break
sleep 0.1
done
@ -91,6 +91,15 @@ chk_msk_nr()
__chk_msk_nr "grep -c token:" "$@"
}
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"
}
wait_msk_nr()
{
local condition="grep -c token:"
@ -289,5 +298,24 @@ flush_pids
chk_msk_inuse 0 "many->0"
chk_msk_cestab 0 "many->0"
chk_listener_nr 0 "no listener sockets"
NR_SERVERS=100
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
chk_listener_nr $NR_SERVERS "many listener sockets"
# graceful termination
for I in $(seq 1 $NR_SERVERS); do
echo a | ip netns exec $ns ./mptcp_connect -p $((I + 20001)) 127.0.0.1 >/dev/null 2>&1 &
done
flush_pids
mptcp_lib_result_print_all_tap
exit $ret