[PATCH bpf-next v4 0/3] bpf: support input xdp_md context in BPF_PROG_TEST_RUN

[Zvi Effron <zeffron@riotgames.com>]

This patchset adds support for passing an xdp_md via ctx_in/ctx_out in
bpf_attr for BPF_PROG_TEST_RUN of XDP programs.

Patch 1 adds initial support for passing XDP meta data in addition to
packet data.

Patch 2 adds support for also specifying the ingress interface and
rx queue.

Patch 3 adds selftests to ensure functionality is correct.

Changelog:
----------
v3->v4
v3: https://lore.kernel.org/bpf/20210602190815.8096-1-zeffron@riotgames.com/

 * Clean up nits
 * Validate xdp_md->data_end in bpf_prog_test_run_xdp
 * Remove intermediate metalen variables

v2 -> v3
v2: https://lore.kernel.org/bpf/20210527201341.7128-1-zeffron@riotgames.com/

 * Check errno first in selftests
 * Use DECLARE_LIBBPF_OPTS
 * Rename tattr to opts in selftests
 * Remove extra new line
 * Rename convert_xdpmd_to_xdpb to xdp_convert_md_to_buff
 * Rename convert_xdpb_to_xdpmd to xdp_convert_buff_to_md
 * Move declaration of device and rxqueue in xdp_convert_md_to_buff to
  patch 2
 * Reorder the kfree calls in bpf_prog_test_run_xdp

v1 -> v2
v1: https://lore.kernel.org/bpf/20210524220555.251473-1-zeffron@riotgames.com

 * Fix null pointer dereference with no context
 * Use the BPF skeleton and replace CHECK with ASSERT macros

Zvi Effron (3):
  bpf: support input xdp_md context in BPF_PROG_TEST_RUN
  bpf: support specifying ingress via xdp_md context in
    BPF_PROG_TEST_RUN
  selftests/bpf: Add test for xdp_md context in BPF_PROG_TEST_RUN

 include/uapi/linux/bpf.h                      |   3 -
 net/bpf/test_run.c                            |  91 ++++++++++++--
 .../bpf/prog_tests/xdp_context_test_run.c     | 114 ++++++++++++++++++
 .../bpf/progs/test_xdp_context_test_run.c     |  20 +++
 4 files changed, 218 insertions(+), 10 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/xdp_context_test_run.c
 create mode 100644 tools/testing/selftests/bpf/progs/test_xdp_context_test_run.c


base-commit: 56b8b7f9533b5c40cbc1266b5cc6a3b19dfd2aad
-- 
2.31.1