[PATCH bpf-next v2 0/4] bpf: Support non-linear skbs for BPF_PROG_TEST_RUN

[Paul Chaignon <paul.chaignon@gmail.com>]

This patchset adds support for non-linear skbs when running tc programs
with BPF_PROG_TEST_RUN.

We've had multiple bugs in the past few years in Cilium caused by
missing calls to bpf_skb_pull_data(). Daniel suggested this new
BPF_PROG_TEST_RUN flag as a way to uncover these bugs in our BPF tests.

Changes in v2:
  - Made the linear size configurable via ctx->data_end, as suggested
    by Amery.
  - Reworked the selftests to allow testing the configurable linear
    size.
  - Fix warnings reported by kernel test robot on first commit.
  - Rebased.

Paul Chaignon (4):
  bpf: Refactor cleanup of bpf_prog_test_run_skb
  bpf: Craft non-linear skbs in BPF_PROG_TEST_RUN
  selftests/bpf: Support non-linear flag in test loader
  selftests/bpf: Test direct packet access on non-linear skbs

 include/uapi/linux/bpf.h                      |   4 +
 net/bpf/test_run.c                            | 120 ++++++++++++------
 tools/include/uapi/linux/bpf.h                |   4 +
 tools/testing/selftests/bpf/progs/bpf_misc.h  |   4 +
 .../bpf/progs/verifier_direct_packet_access.c |  54 ++++++++
 tools/testing/selftests/bpf/test_loader.c     |  20 ++-
 6 files changed, 168 insertions(+), 38 deletions(-)

-- 
2.43.0