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linux/tools/testing/selftests/net
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Paolo Abeni e468e5e6ab selftests: mptcp: more stable simult_flows tests 
commit 8c09412e58 upstream.

By default, the netem qdisc can keep up to 1000 packets under its belly
to deal with the configured rate and delay. The simult flows test-case
simulates very low speed links, to avoid problems due to slow CPUs and
the TCP stack tend to transmit at a slightly higher rate than the
(virtual) link constraints.

All the above causes a relatively large amount of packets being enqueued
in the netem qdiscs - the longer the transfer, the longer the queue -
producing increasingly high TCP RTT samples and consequently increasingly
larger receive buffer size due to DRS.

When the receive buffer size becomes considerably larger than the needed
size, the tests results can flake, i.e. because minimal inaccuracy in the
pacing rate can lead to a single subflow usage towards the end of the
connection for a considerable amount of data.

Address the issue explicitly setting netem limits suitable for the
configured link speeds and unflake all the affected tests.

Fixes: 1a418cb8e8 ("mptcp: simult flow self-tests")
Cc: stable@vger.kernel.org
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>
Link: https://patch.msgid.link/20260303-net-mptcp-misc-fixes-7-0-rc2-v1-1-4b5462b6f016@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2026-04-18 10:33:09 +02:00
..
af_unix af_unix: selftest: Fix the size of the parameter to connect() 2023-01-18 11:48:54 +01:00
forwarding selftests: forwarding: vxlan_bridge_1d: fix test failure with br_netfilter enabled 2026-03-04 07:19:51 -05:00
mptcp selftests: mptcp: more stable simult_flows tests 2026-04-18 10:33:09 +02:00
.gitignore tools/testing: add a selftest for SO_NETNS_COOKIE 2021-06-24 11:13:05 -07:00
altnames.sh selftest: net: fix typo in altname test 2021-09-12 10:48:26 +01:00
bareudp.sh selftests: net: use BASH for bareudp testing 2025-12-07 06:09:31 +09:00
config Revert "selftests: net: Add tls config dependency for tls selftests" 2022-04-13 20:59:25 +02:00
devlink_port_split.py selftests: net: devlink_port_split.py: skip test if no suitable device available 2023-03-22 13:31:28 +01:00
drop_monitor_tests.sh selftests: net: Add drop monitor test 2020-09-30 18:01:26 -07:00
fcnal-test.sh selftests: Replace sleep with slowwait 2025-12-07 06:09:22 +09:00
fib-onlink-tests.sh selftests: fib-onlink: Make quiet by default 2019-05-22 17:50:24 -07:00
fib_nexthop_multiprefix.sh selftests/net: fix grep checking for fib_nexthop_multiprefix 2024-01-25 14:52:38 -08:00
fib_nexthops.sh selftests: fib_nexthops: Fix creation of non-FDB nexthops 2025-10-02 13:39:12 +02:00
fib_rule_tests.sh selftests/net: Use kselftest skip code for skipped tests 2021-08-24 16:49:09 -07:00
fib_tests.sh selftests: fib_tests: mute cleanup error message 2023-05-30 13:55:31 +01:00
fin_ack_lat.c selftests: net: Add FIN_ACK processing order related latency spike test 2020-02-02 13:33:21 -08:00
fin_ack_lat.sh selftests: net: Add FIN_ACK processing order related latency spike test 2020-02-02 13:33:21 -08:00
gre_gso.sh selftests: net: switch to socat in the GSO GRE test 2021-11-25 09:48:33 +01:00
gro.c selftests/net: use destination options instead of hop-by-hop 2025-12-07 06:09:25 +09:00
gro.sh selftests/net: have gro.sh -t return a correct exit code 2025-06-04 14:38:00 +02:00
hwtstamp_config.c selftests: move timestamping selftests to net folder 2020-03-29 21:48:30 -07:00
icmp.sh selftests/net: Add icmp.sh for testing ICMP dummy address responses 2021-06-18 12:13:24 -07:00
icmp_redirect.sh selftests: icmp_redirect: pass xfail=0 to log_test() 2021-12-22 09:32:40 +01:00
in_netns.sh selftests/net: fix in_netns.sh script 2018-03-07 12:26:05 -05:00
ioam6.sh selftests: net: modify IOAM tests for undef bits 2021-10-12 11:49:49 +01:00
ioam6_parser.c selftests: net: modify IOAM tests for undef bits 2021-10-12 11:49:49 +01:00
ip6_gre_headroom.sh selftests: net: Test headroom handling of ip6_gre devices 2018-06-26 23:03:01 +09:00
ip_defrag.c selftests: net: ip_defrag: ignore EPERM 2020-06-02 15:54:20 -07:00
ip_defrag.sh selftests: net: ip_defrag: modprobe missing nf_defrag_ipv6 support 2020-07-17 12:49:18 -07:00
ipsec.c selftests/net/ipsec: Fix Null pointer dereference in rtattr_pack() 2025-03-13 12:50:19 +01:00
ipv6_flowlabel.c selftests/net: ipv6 flowlabel 2019-05-28 17:18:53 -07:00
ipv6_flowlabel.sh selftests/net: ipv6 flowlabel 2019-05-28 17:18:53 -07:00
ipv6_flowlabel_mgr.c selftests/net: ipv6 flowlabel 2019-05-28 17:18:53 -07:00
l2tp.sh selftests: Make l2tp.sh executable 2019-10-22 14:01:35 -07:00
Makefile kselftests/net: add missed toeplitz.sh/toeplitz_client.sh to Makefile 2021-11-18 19:17:05 +01:00
msg_zerocopy.c selftests: make order checking verbose in msg_zerocopy selftest 2024-07-18 13:07:31 +02:00
msg_zerocopy.sh selftests: extend zerocopy tests to udp 2018-12-03 15:58:32 -08:00
net_helper.sh selftests: net: more strict check in net_helper 2024-10-17 15:12:02 +02:00
netdevice.sh selftests: net: return Kselftest Skip code for skipped tests 2018-05-30 15:29:06 -06:00
nettest.c selftests: nettest: Add --{force,no}-bind-key-ifindex 2021-10-15 14:36:57 +01:00
pmtu.sh net: ipv4: Cache pmtu for all packet paths if multipath enabled 2025-03-13 12:50:43 +01:00
psock_fanout.c tools/net: Use bitwise instead of arithmetic operator for flags 2021-08-20 14:55:53 +01:00
psock_lib.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 222 2019-05-30 11:29:55 -07:00
psock_snd.c selftests/net: add packet socket packet_snd test 2018-06-04 09:50:01 -04:00
psock_snd.sh selftests/net: remove min gso test in packet_snd 2021-08-02 10:34:04 +01:00
psock_tpacket.c selftests/net: Ensure assert() triggers in psock_tpacket.c 2025-12-07 06:09:18 +09:00
reuseaddr_conflict.c selftests: reuseaddr_conflict: add missing new line at the end of the output 2024-04-10 16:19:39 +02:00
reuseaddr_ports_exhausted.c selftests/net: fix warnings on reuseaddr_ports_exhausted 2021-03-16 15:01:21 -07:00
reuseaddr_ports_exhausted.sh selftests: net: Add SO_REUSEADDR test to check if 4-tuples are fully utilized. 2020-03-12 12:08:09 -07:00
reuseport_addr_any.c selftests/net: add definition for SOL_DCCP to fix compilation errors for old libc 2020-03-21 20:23:10 -07:00
reuseport_addr_any.sh selftests: net: test that listening sockets match on address properly 2018-12-14 15:55:20 -08:00
reuseport_bpf.c selftests: Fix the if conditions of in test_extra_filter() 2022-10-05 10:39:43 +02:00
reuseport_bpf_cpu.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
reuseport_bpf_numa.c selftests: net: reuseport_bpf_numa: don't fail if no numa support 2018-05-23 12:21:02 +02:00
reuseport_dualstack.c selftests: net: reuseport_dualstack: fix uninitalized parameter 2019-11-01 15:11:02 -07:00
route_localnet.sh selftests: add route_localnet test script 2019-06-24 09:02:47 -07:00
rtnetlink.sh selftests: rtnetlink.sh: remove esp4_offload after test 2025-08-28 16:24:09 +02:00
run_afpackettests selftests/net: Use kselftest skip code for skipped tests 2021-08-24 16:49:09 -07:00
run_netsocktests selftests/net: correct the return value for run_netsocktests 2019-04-19 14:39:51 -07:00
rxtimestamp.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-08-02 01:02:12 -07:00
rxtimestamp.sh selftests/net: plug rxtimestamp test into kselftest framework 2020-06-23 20:36:46 -07:00
settings selftests/net: bump timeout to 5 minutes 2021-04-23 14:08:58 -07:00
setup_loopback.sh selftests: net: Remove executable bits from library scripts 2024-10-17 15:11:49 +02:00
setup_veth.sh selftests: net: give more time for GRO aggregation 2024-02-23 08:54:53 +01:00
so_netns_cookie.c tools/testing: add a selftest for SO_NETNS_COOKIE 2021-06-24 11:13:05 -07:00
so_txtime.c selftests/net: so_txtime: usage(): fix documentation of default clock 2022-05-12 12:30:17 +02:00
so_txtime.sh selftests/net: so_txtime multi-host support 2021-03-31 17:48:21 -07:00
socket.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
srv6_end_dt4_l3vpn_test.sh selftets: seg6: disable rp_filter by default in srv6_end_dt4_l3vpn_test 2023-05-24 17:36:49 +01:00
srv6_end_dt6_l3vpn_test.sh selftests/net: Use kselftest skip code for skipped tests 2021-08-24 16:49:09 -07:00
srv6_end_dt46_l3vpn_test.sh selftests: srv6: make srv6_end_dt46_l3vpn_test more robust 2023-05-17 11:50:16 +02:00
tcp_fastopen_backup_key.c selftests/net: fix warnings in TFO key rotation selftest 2019-06-16 14:27:14 -07:00
tcp_fastopen_backup_key.sh selftests: net: tcp_fastopen_backup_key.sh: fix shellcheck issue 2019-08-15 11:34:32 -07:00
tcp_inq.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 253 2019-06-05 17:30:27 +02:00
tcp_mmap.c selftests: net: tcp_mmap: Use huge pages in receive path 2020-08-20 16:14:53 -07:00
test_blackhole_dev.sh blackhole_dev: add a selftest 2019-07-01 19:34:46 -07:00
test_bpf.sh License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
test_vxlan_fdb_changelink.sh selftests: net: Add test_vxlan_fdb_changelink.sh 2018-12-18 21:18:26 -08:00
test_vxlan_under_vrf.sh selftests: net: test_vxlan_under_vrf: fix HV connectivity test 2026-01-19 13:10:12 +01:00
timestamping.c selftests/net: timestamping: Fix bind_phc check 2022-04-08 14:23:26 +02:00
tls.c selftests: tls: use exact comparison in recv_partial 2024-03-26 18:21:12 -04:00
toeplitz.c selftests: drv-net: fix RPS mask handling for high CPU numbers 2026-02-06 16:41:46 +01:00
toeplitz.sh selftests: net: Use "grep -E" instead of "egrep" 2022-12-21 17:36:38 +01:00
toeplitz_client.sh selftests/net: toeplitz test 2021-08-05 13:14:09 +01:00
traceroute.sh selftests: traceroute: Use require_command() 2025-12-07 06:09:21 +09:00
txring_overwrite.c selftests: txring_overwrite: fix incorrect test of mmap() return value 2019-07-08 15:39:38 -07:00
txtimestamp.c selftests: txtimestamp: fix compilation issue 2021-02-04 20:22:30 -08:00
txtimestamp.sh selftest: txtimestamp: fix net ns entry logic 2020-07-21 16:11:07 -07:00
udpgro.sh selftests: net: increase inter-packet timeout in udpgro.sh 2025-08-28 16:24:01 +02:00
udpgro_bench.sh selftests/net: synchronize udpgro tests' tx and rx connection 2024-10-17 15:11:49 +02:00
udpgro_fwd.sh selftests: net: gro fwd: update vxlan GRO test expectations 2024-04-10 16:19:38 +02:00
udpgso.c udp: gso: do not drop small packets when PMTU reduces 2025-03-13 12:50:22 +01:00
udpgso.sh selftests: udp gso with corking 2018-04-26 15:09:52 -04:00
udpgso_bench.sh selftests: net: udpgso_bench: Fix racing bug between the rx/tx programs 2023-02-09 11:26:38 +01:00
udpgso_bench_rx.c selftests: net: cut more slack for gro fwd tests. 2024-02-23 08:54:57 +01:00
udpgso_bench_tx.c selftests: net: udpgso_bench_tx: Cater for pending datagrams zerocopy benchmarking 2023-02-09 11:26:38 +01:00
unicast_extensions.sh selftests/net: Use kselftest skip code for skipped tests 2021-08-24 16:49:09 -07:00
veth.sh selftests/net: fix section name when using xdp_dummy.o 2022-07-12 16:35:19 +02:00
vrf-xfrm-tests.sh selftests: net: vrf-xfrm-tests: change authentication and encryption algos 2024-03-01 13:21:52 +01:00
vrf_route_leaking.sh selftests: Add VRF route leaking tests 2020-10-14 17:14:28 -07:00
vrf_strict_mode_test.sh selftests/net: Use kselftest skip code for skipped tests 2021-08-24 16:49:09 -07:00
xfrm_policy.sh xfrm: Fix wraparound in xfrm_policy_addr_delta() 2021-01-04 10:35:09 +01:00