[net v1 PATCH 0/4] net: fix regressions for generic-XDP

[Jesper Dangaard Brouer <brouer@redhat.com>]

Thanks to Brandon Cazander, who wrote a very detailed bug report that
even used perf probe's on xdp-newbies mailing list, we discovered that
generic-XDP contains some regressions when using bpf_xdp_adjust_head().

First issue were that my selftests script, that use bpf_xdp_adjust_head(),
by mistake didn't use generic-XDP any-longer. That selftest should have
caught the real regression introduced in commit 458bf2f224f0 ("net: core:
support XDP generic on stacked devices.").

To verify this patchset fix the regressions, you can invoked manually via:

  cd tools/testing/selftests/bpf/
  sudo ./test_xdp_vlan_mode_generic.sh
  sudo ./test_xdp_vlan_mode_native.sh

Link: https://www.spinics.net/lists/xdp-newbies/msg01231.html
Fixes: 458bf2f224f0 ("net: core: support XDP generic on stacked devices.")
Reported by: Brandon Cazander <brandon.cazander@multapplied.net>
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>

---

Jesper Dangaard Brouer (4):
      bpf: fix XDP vlan selftests test_xdp_vlan.sh
      selftests/bpf: add wrapper scripts for test_xdp_vlan.sh
      selftests/bpf: reduce time to execute test_xdp_vlan.sh
      net: fix bpf_xdp_adjust_head regression for generic-XDP


 net/core/dev.c                                     |   15 ++++-
 tools/testing/selftests/bpf/Makefile               |    3 +
 tools/testing/selftests/bpf/test_xdp_vlan.sh       |   57 ++++++++++++++++----
 .../selftests/bpf/test_xdp_vlan_mode_generic.sh    |    9 +++
 .../selftests/bpf/test_xdp_vlan_mode_native.sh     |    9 +++
 5 files changed, 75 insertions(+), 18 deletions(-)
 create mode 100755 tools/testing/selftests/bpf/test_xdp_vlan_mode_generic.sh
 create mode 100755 tools/testing/selftests/bpf/test_xdp_vlan_mode_native.sh

--