[bpf-next,v2,0/2] Support static initialization of BPF_MAP_TYPE_PROG_ARRAY

Message

Hengqi Chen Nov. 28, 2021, 2:16 p.m. UTC

Make libbpf support static initialization of BPF_MAP_TYPE_PROG_ARRAY
with a syntax similar to map-in-map initialization:

    SEC("socket")
    int tailcall_1(void *ctx)
    {
        return 0;
    }

    struct {
        __uint(type, BPF_MAP_TYPE_PROG_ARRAY);
        __uint(max_entries, 2);
        __uint(key_size, sizeof(__u32));
        __array(values, int (void *));
    } prog_array_init SEC(".maps") = {
        .values = {
            [1] = (void *)&tailcall_1,
        },
    };

v1->v2:
  - Add stricter checks on relos collect, some renamings (Andrii)
  - Update selftest to check tailcall result (Andrii)

Hengqi Chen (2):
  libbpf: Support static initialization of BPF_MAP_TYPE_PROG_ARRAY
  selftests/bpf: Test BPF_MAP_TYPE_PROG_ARRAY static initialization

 tools/lib/bpf/libbpf.c                        | 139 ++++++++++++++----
 .../bpf/prog_tests/prog_array_init.c          |  32 ++++
 .../bpf/progs/test_prog_array_init.c          |  39 +++++
 3 files changed, 182 insertions(+), 28 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/prog_array_init.c
 create mode 100644 tools/testing/selftests/bpf/progs/test_prog_array_init.c

--
2.30.2