netdev - [PATCH bpf-next v2 0/3] Add XDP support for bpf_load_hdr

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Date:   Wed, 6 Oct 2021 16:05:40 -0700
From:   Joanne Koong <joannekoong@...com>
To:     <bpf@...r.kernel.org>
CC:     <kafai@...com>, <netdev@...r.kernel.org>, <Kernel-team@...com>,
        Joanne Koong <joannekoong@...com>
Subject: [PATCH bpf-next v2 0/3] Add XDP support for bpf_load_hdr_opt

Currently, bpf_sockops programs have been using bpf_load_hdr_opt() to
parse the tcp header option. It will be useful to allow other bpf prog
types to have a similar way of handling tcp hdr options.

This series adds XDP support for bpf_load_hdr_opt(). At a high level,
these patches are:

1/3 patch - Add functionality for xdp bpf_load_hdr_opt in net/core.

2/3 patch - Rename existing test_tcp_hdr_options to test_sockops_tcp_hdr_options.

3/3 patch - Add tests for xdp bpf_load_hdr_opt (test_xdp_tcp_hdr_options).

v1 -> v2:
* 1/3 - Change "(flags & 0xffffffffffff)" to
(flags & ((1ULL << BPF_LOAD_HDR_OPT_TCP_OFFSET_SHIFT) - 1))
* 3/3 - Skip check_opt_out on failures
* 3/3 - Change CHECKs to ASSERTs

Joanne Koong (3):
  bpf/xdp: Add bpf_load_hdr_opt support for xdp
  bpf/selftests: Rename test_tcp_hdr_options to
    test_sockops_tcp_hdr_options
  bpf/selftests: Add xdp bpf_load_tcp_hdr_options tests

 include/uapi/linux/bpf.h                      |  26 ++-
 net/core/filter.c                             |  88 ++++++--
 tools/include/uapi/linux/bpf.h                |  26 ++-
 ...dr_options.c => sockops_tcp_hdr_options.c} |  18 +-
 .../bpf/prog_tests/xdp_tcp_hdr_options.c      | 144 +++++++++++++
 ....c => test_sockops_misc_tcp_hdr_options.c} |   0
 ...tions.c => test_sockops_tcp_hdr_options.c} |   0
 .../bpf/progs/test_xdp_tcp_hdr_options.c      | 198 ++++++++++++++++++
 8 files changed, 454 insertions(+), 46 deletions(-)
 rename tools/testing/selftests/bpf/prog_tests/{tcp_hdr_options.c => sockops_tcp_hdr_options.c} (96%)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/xdp_tcp_hdr_options.c
 rename tools/testing/selftests/bpf/progs/{test_misc_tcp_hdr_options.c => test_sockops_misc_tcp_hdr_options.c} (100%)
 rename tools/testing/selftests/bpf/progs/{test_tcp_hdr_options.c => test_sockops_tcp_hdr_options.c} (100%)
 create mode 100644 tools/testing/selftests/bpf/progs/test_xdp_tcp_hdr_options.c

-- 
2.30.2