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
