[SRU][R][PATCH 0/1] Fix ipsec_offload rtnetlink.sh selftest on s390x (LP: 2166631)

[Andrei Gherzan]

BugLink: https://bugs.launchpad.net/bugs/2166631

SRU Justification:

[Impact]
The ipsec_offload subtest of net/rtnetlink.sh (kselftests) fails on
big-endian (s390x). The netdevsim driver writes the IPsec key/salt values
to its debugfs file in CPU-native byte order, while the selftest hardcodes
the little-endian representation, so the diff mismatches on s390x:

  FAIL: ipsec_offload incorrect driver data
  FAIL: ipsec_offload

[Fix]
Test-only change: detect big-endian via lscpu and byte-swap the test's
input key/salt so the driver's native-order output matches the expected
block on both endiannesses. Already applied to Focal/Jammy/Noble/Questing;
Resolute is the only series still missing it. Cherry-picked from Noble
commit 2e2160b90ec4.

[Test Plan]
On an s390x resolute VM: sudo ./rtnetlink.sh -t kci_test_ipsec_offload -v
  -> PASS: ipsec_offload (was FAIL: ipsec_offload incorrect driver data).
On x86_64: same subtest still PASS (no regression).
Verify at the ipsec_offload subtest level: the aggregate rtnetlink.sh
still exits non-zero on s390x due to the pre-existing, unrelated
FAIL: bridge_parent_id (not part of this bug).

[Where problems could occur]
Extremely low: only tools/testing/selftests rtnetlink.sh is touched;
no kernel/driver code is modified.

[Other Info]
Prerequisite commit c71bc6da6198 ("netdevsim: print human readable IP
address") is already present in Resolute, so the Focal-specific rxipaddr
follow-up is not needed here.

Alessio Faina (1):
  UBUNTU: [SAUCE] Fix selftest/net/rtnetlink.sh for Big Endian

 tools/testing/selftests/net/rtnetlink.sh | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

-- 
2.43.0