kernel/linux.git/tools/testing/selftests/net, branch v5.10.257

selftests: mptcp: more stable simult_flows tests

2026-04-18T08:30:51+00:00

commit 8c09412e584d9bcc0e71d758ec1008d1c8d1a326 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: 1a418cb8e888 ("mptcp: simult flow self-tests") Cc: stable@vger.kernel.org Signed-off-by: Paolo Abeni Reviewed-by: Matthieu Baerts (NGI0) Signed-off-by: Matthieu Baerts (NGI0) Link: https://patch.msgid.link/20260303-net-mptcp-misc-fixes-7-0-rc2-v1-1-4b5462b6f016@kernel.org Signed-off-by: Jakub Kicinski Signed-off-by: Greg Kroah-Hartman

selftests: forwarding: tc_actions: Use ncat instead of nc

2026-03-04T12:19:47+00:00

[ Upstream commit 5e8670610b93158ffacc3241f835454ff26a3469 ] The test relies on 'nc' being the netcat version from the nmap project. While this seems to be the case on Fedora, it is not the case on Ubuntu, resulting in failures such as [1]. Fix by explicitly using the 'ncat' utility from the nmap project and the skip the test in case it is not installed. [1] # timeout set to 0 # selftests: net/forwarding: tc_actions.sh # TEST: gact drop and ok (skip_hw) [ OK ] # TEST: mirred egress flower redirect (skip_hw) [ OK ] # TEST: mirred egress flower mirror (skip_hw) [ OK ] # TEST: mirred egress matchall mirror (skip_hw) [ OK ] # TEST: mirred_egress_to_ingress (skip_hw) [ OK ] # nc: invalid option -- '-' # usage: nc [-46CDdFhklNnrStUuvZz] [-I length] [-i interval] [-M ttl] # [-m minttl] [-O length] [-P proxy_username] [-p source_port] # [-q seconds] [-s sourceaddr] [-T keyword] [-V rtable] [-W recvlimit] # [-w timeout] [-X proxy_protocol] [-x proxy_address[:port]] # [destination] [port] # nc: invalid option -- '-' # usage: nc [-46CDdFhklNnrStUuvZz] [-I length] [-i interval] [-M ttl] # [-m minttl] [-O length] [-P proxy_username] [-p source_port] # [-q seconds] [-s sourceaddr] [-T keyword] [-V rtable] [-W recvlimit] # [-w timeout] [-X proxy_protocol] [-x proxy_address[:port]] # [destination] [port] # TEST: mirred_egress_to_ingress_tcp (skip_hw) [FAIL] # server output check failed # INFO: Could not test offloaded functionality not ok 80 selftests: net/forwarding: tc_actions.sh # exit=1 Fixes: ca22da2fbd69 ("act_mirred: use the backlog for nested calls to mirred ingress") Reported-by: Mirsad Todorovac Closes: https://lore.kernel.org/netdev/adc5e40d-d040-a65e-eb26-edf47dac5b02@alu.unizg.hr/ Signed-off-by: Ido Schimmel Reviewed-by: Petr Machata Tested-by: Mirsad Todorovac Reviewed-by: Hangbin Liu Acked-by: Nikolay Aleksandrov Link: https://lore.kernel.org/r/20230808141503.4060661-12-idosch@nvidia.com Signed-off-by: Jakub Kicinski Stable-dep-of: 32b70e62034a ("selftests: tc_actions: don't dump 2MB of \0 to stdout") Signed-off-by: Sasha Levin

selftests: forwarding: tc_actions: cleanup temporary files when test is aborted

2026-03-04T12:19:47+00:00

[ Upstream commit f58531716ced8975a4ade108ef4af35f98722af7 ] remove temporary files created by 'mirred_egress_to_ingress_tcp' test in the cleanup() handler. Also, change variable names to avoid clashing with globals from lib.sh. Suggested-by: Paolo Abeni Signed-off-by: Davide Caratti Link: https://lore.kernel.org/r/091649045a017fc00095ecbb75884e5681f7025f.1676368027.git.dcaratti@redhat.com Signed-off-by: Jakub Kicinski Stable-dep-of: 32b70e62034a ("selftests: tc_actions: don't dump 2MB of \0 to stdout") Signed-off-by: Sasha Levin

selftests: forwarding: vxlan_bridge_1d: fix test failure with br_netfilter enabled

2026-03-04T12:19:46+00:00

[ Upstream commit 02cb2e6bacbb08ebf6acb61be816efd11e1f4a21 ] The test generates VXLAN traffic using mausezahn, where the encapsulated inner IPv4 packet contains a zero IP header checksum. After VXLAN decapsulation, such packets do not pass sanity checks in br_netfilter and are dropped, which causes the test to fail. Fix this by calculating and setting a valid IPv4 header checksum for the encapsulated packet generated by mausezahn, so that the packet is accepted by br_netfilter. Fixed by using the payload_template_calc_checksum() / payload_template_expand_checksum() helpers that are only available in v6.3 and newer kernels. Fixes: a0b61f3d8ebf ("selftests: forwarding: vxlan_bridge_1d: Add an ECN decap test") Signed-off-by: Aleksei Oladko Reviewed-by: Ido Schimmel Link: https://patch.msgid.link/20260213131907.43351-2-aleksey.oladko@virtuozzo.com Signed-off-by: Paolo Abeni Signed-off-by: Sasha Levin

selftests: mptcp: pm: ensure unknown flags are ignored

2026-02-19T15:20:26+00:00

commit 29f4801e9c8dfd12bdcb33b61a6ac479c7162bd7 upstream. This validates the previous commit: the userspace can set unknown flags -- the 7th bit is currently unused -- without errors, but only the supported ones are printed in the endpoints dumps. The 'Fixes' tag here below is the same as the one from the previous commit: this patch here is not fixing anything wrong in the selftests, but it validates the previous fix for an issue introduced by this commit ID. Fixes: 01cacb00b35c ("mptcp: add netlink-based PM") Cc: stable@vger.kernel.org Reviewed-by: Mat Martineau Signed-off-by: Matthieu Baerts (NGI0) Link: https://patch.msgid.link/20251205-net-mptcp-misc-fixes-6-19-rc1-v1-2-9e4781a6c1b8@kernel.org Signed-off-by: Jakub Kicinski [ Conflicts in pm_netlink.sh, because some refactoring have been done later on: commit 0d16ed0c2e74 ("selftests: mptcp: add {get,format}_endpoint(s) helpers") and commit c99d57d0007a ("selftests: mptcp: use pm_nl endpoint ops") are not in this version. The same operation can still be done at the same place, without using the new helpers. Also, commit 1dc88d241f92 ("selftests: mptcp: pm_nl_ctl: always look for errors") is not in this version, and create a conflict in the context which is not related to the modification here. In v5.10, endpoints couldn't be re-used directly, so the flag is tested before. Conflicts in pm_nl_ctl.c, because commit 69c6ce7b6eca ("selftests: mptcp: add implicit endpoint test case") and commit 371b90377e60 ("selftests: mptcp: set and print the fullmesh flag") are not in this version, and caused a conflict in the context which is not related to the modification here. ] Signed-off-by: Matthieu Baerts (NGI0) Signed-off-by: Greg Kroah-Hartman

Revert "selftests: Replace sleep with slowwait"

2026-02-06T15:40:14+00:00

This reverts commit 780095c51e34ec7cdf6f651b4c4f2b35680779e4 which is commit 2f186dd5585c3afb415df80e52f71af16c9d3655 upstream. To quote Ben: The slowwait function isn't defined in 5.10 (or any stable branch older than 6.9). Link: https://lore.kernel.org/r/b052b71589bb576dcad441eba38c20da81443a46.camel@decadent.org.uk Reported-by: Ben Hutchings Cc: David Ahern Cc: Simon Horman Cc: Jakub Kicinski Cc: Sasha Levin Signed-off-by: Greg Kroah-Hartman

selftests: Replace sleep with slowwait

2025-12-06T21:08:13+00:00

[ Upstream commit 2f186dd5585c3afb415df80e52f71af16c9d3655 ] Replace the sleep in kill_procs with slowwait. Signed-off-by: David Ahern Reviewed-by: Simon Horman Link: https://patch.msgid.link/20250910025828.38900-2-dsahern@kernel.org Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin

selftests: Disable dad for ipv6 in fcnal-test.sh

2025-12-06T21:08:13+00:00

[ Upstream commit 53d591730ea34f97a82f7ec6e7c987ca6e34dc21 ] Constrained test environment; duplicate address detection is not needed and causes races so disable it. Signed-off-by: David Ahern Reviewed-by: Simon Horman Link: https://patch.msgid.link/20250910025828.38900-1-dsahern@kernel.org Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin

selftests: traceroute: Use require_command()

2025-12-06T21:08:13+00:00

[ Upstream commit 47efbac9b768553331b9459743a29861e0acd797 ] Use require_command() so that the test will return SKIP (4) when a required command is not present. Before: # ./traceroute.sh SKIP: Could not run IPV6 test without traceroute6 SKIP: Could not run IPV4 test without traceroute $ echo $? 0 After: # ./traceroute.sh TEST: traceroute6 not installed [SKIP] $ echo $? 4 Reviewed-by: Petr Machata Reviewed-by: David Ahern Signed-off-by: Ido Schimmel Link: https://patch.msgid.link/20250908073238.119240-6-idosch@nvidia.com Signed-off-by: Paolo Abeni Signed-off-by: Sasha Levin

selftests/net: Ensure assert() triggers in psock_tpacket.c

2025-12-06T21:08:10+00:00

[ Upstream commit bc4c0a48bdad7f225740b8e750fdc1da6d85e1eb ] The get_next_frame() function in psock_tpacket.c was missing a return statement in its default switch case, leading to a compiler warning. This was caused by a `bug_on(1)` call, which is defined as an `assert()`, being compiled out because NDEBUG is defined during the build. Instead of adding a `return NULL;` which would silently hide the error and could lead to crashes later, this change restores the original author's intent. By adding `#undef NDEBUG` before including , we ensure the assertion is active and will cause the test to abort if this unreachable code is ever executed. Signed-off-by: Wake Liu Link: https://patch.msgid.link/20250809062013.2407822-1-wakel@google.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin