[SRU][N][PATCH 0/1] selftests: net: move wait_local_port_listen to lib.sh

[ChunAn Wu]

BugLink: https://bugs.launchpad.net/bugs/2139460

SRU Justification:

[ Impact ]

The net selftest helper wait_local_port_listen() is carried in the
standalone tools/testing/selftests/net/net_helper.sh file in Noble. Upstream
has moved this helper into the common tools/testing/selftests/net/lib.sh file
and updated the affected tests to source lib.sh directly.

Without this backport, affected net selftests can fail with
"wait_local_port_listen: command not found" when tests are aligned with the
newer upstream helper layout.

[ Fix ]

Backport upstream commit:
- d9d836bfa5e6 ("selftests: net: move wait_local_port_listen to lib.sh")

The backport moves wait_local_port_listen() into lib.sh, updates the Noble
tests that used net_helper.sh to source lib.sh, removes net_helper.sh from
TEST_FILES, and deletes the obsolete net_helper.sh file.

[ Test Plan ]

Validated in an Ubuntu Noble LXD VM (VM24):

1. Built the required net selftest helper binaries:
   - udpgso_bench_tx
   - udpgso_bench_rx
   - xdp_dummy.o
   - nat6to4.o
2. Ran affected helper users:
   - ./udpgro.sh
   - ./udpgro_bench.sh
   - ./udpgro_frglist.sh
   - ./pmtu.sh pmtu_ipv4_br_vxlan4_exception
   - ./ipv6_route_update_soft_lockup.sh
3. Verified the tests completed successfully and exercised
   wait_local_port_listen() from lib.sh.

[ Where problems could occur ]

The change is limited to networking selftest scripts under
tools/testing/selftests/net. It does not change kernel runtime code. Possible
regressions would be limited to selftest execution if a script still expects
net_helper.sh. Noble's existing net_helper.sh users are updated in this patch.

[ Other Info ]

The upstream commit also touched newer selftests that do not exist in Noble
(for example, tools/testing/selftests/drivers/net/ and busy_poll_test.sh).
Those unrelated selftest additions were not backported.

Hangbin Liu (1):
  selftests: net: move wait_local_port_listen to lib.sh

 tools/testing/selftests/net/Makefile          |  2 +-
 .../net/ipv6_route_update_soft_lockup.sh      |  1 -
 tools/testing/selftests/net/lib.sh            | 21 ++++++++++++++++
 tools/testing/selftests/net/net_helper.sh     | 25 -------------------
 tools/testing/selftests/net/pmtu.sh           |  1 -
 tools/testing/selftests/net/udpgro.sh         |  2 +-
 tools/testing/selftests/net/udpgro_bench.sh   |  2 +-
 tools/testing/selftests/net/udpgro_frglist.sh |  2 +-
 tools/testing/selftests/net/udpgro_fwd.sh     |  2 +-
 9 files changed, 26 insertions(+), 32 deletions(-)
 delete mode 100644 tools/testing/selftests/net/net_helper.sh

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2.34.1