[PATCH bpf-next v2 0/4] selftests/bpf: convert test_tc_tunnel.sh to test_progs

["Alexis Lothoré (eBPF Foundation)" <alexis.lothore@bootlin.com>]

Hello,
this is the v2 of test_tc_tunnel conversion into test_progs framework.
test_tc_tunnel.sh tests a variety of tunnels based on BPF: packets are
encapsulated by a BPF program on the client egress. We then check that
those packets can be decapsulated on server ingress side, either thanks
to kernel-based or BPF-based decapsulation. Those tests are run thanks
to two veths in two dedicated namespaces.

- patches 1 and 2 are preparatory patches
- patch 3 introduce tc_tunnel test into test_progs
- patch 4 gets rid of the test_tc_tunnel.sh script

The new test has been executed both in some x86 local qemu machine, as
well as in CI:

  # ./test_progs -a tc_tunnel
  #454/1   tc_tunnel/ipip_none:OK
  #454/2   tc_tunnel/ipip6_none:OK
  #454/3   tc_tunnel/ip6tnl_none:OK
  #454/4   tc_tunnel/sit_none:OK
  #454/5   tc_tunnel/vxlan_eth:OK
  #454/6   tc_tunnel/ip6vxlan_eth:OK
  #454/7   tc_tunnel/gre_none:OK
  #454/8   tc_tunnel/gre_eth:OK
  #454/9   tc_tunnel/gre_mpls:OK
  #454/10  tc_tunnel/ip6gre_none:OK
  #454/11  tc_tunnel/ip6gre_eth:OK
  #454/12  tc_tunnel/ip6gre_mpls:OK
  #454/13  tc_tunnel/udp_none:OK
  #454/14  tc_tunnel/udp_eth:OK
  #454/15  tc_tunnel/udp_mpls:OK
  #454/16  tc_tunnel/ip6udp_none:OK
  #454/17  tc_tunnel/ip6udp_eth:OK
  #454/18  tc_tunnel/ip6udp_mpls:OK
  #454     tc_tunnel:OK
  Summary: 1/18 PASSED, 0 SKIPPED, 0 FAILED

Signed-off-by: Alexis Lothoré (eBPF Foundation) <alexis.lothore@bootlin.com>
---
Changes in v2:
- declare a single tc_prog_attach helper rather than multiple,
  intermediate helpers
- move the new helper to network_helpers.c rather than a dedicated
  file
- do not rename existing tc_helpers.c/h pair (drop patch)
- keep only the minimal set of needed NS switches
- Link to v1: https://lore.kernel.org/r/20251017-tc_tunnel-v1-0-2d86808d86b2@bootlin.com

---
Alexis Lothoré (eBPF Foundation) (4):
      selftests/bpf: add tc helpers
      selftests/bpf: make test_tc_tunnel.bpf.c compatible with big endian platforms
      selftests/bpf: integrate test_tc_tunnel.sh tests into test_progs
      selftests/bpf: remove test_tc_tunnel.sh

 tools/testing/selftests/bpf/Makefile               |   1 -
 tools/testing/selftests/bpf/network_helpers.c      |  45 ++
 tools/testing/selftests/bpf/network_helpers.h      |  16 +
 .../selftests/bpf/prog_tests/test_tc_tunnel.c      | 660 +++++++++++++++++++++
 .../testing/selftests/bpf/prog_tests/test_tunnel.c | 107 +---
 tools/testing/selftests/bpf/progs/test_tc_tunnel.c |  95 ++-
 tools/testing/selftests/bpf/test_tc_tunnel.sh      | 320 ----------
 7 files changed, 776 insertions(+), 468 deletions(-)
---
base-commit: b92bbe400a50e4eb033b378252292d1cc19cabae
change-id: 20250811-tc_tunnel-c61342683f18

Best regards,
-- 
Alexis Lothoré, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com