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| author | Hengqi Chen <hengqi.chen@gmail.com> | 2021-11-28 22:16:32 +0800 |
|---|---|---|
| committer | Andrii Nakryiko <andrii@kernel.org> | 2021-11-28 22:24:52 -0800 |
| commit | 341ac5ffc4bd859103899c876902caf07cc97ea4 (patch) | |
| tree | ec45526551ecc13ef65cf53b47e396e0caca3c97 /tools/testing/selftests/bpf/prog_tests/prog_array_init.c | |
| parent | e32cb12ff52a2840fc1248998717f7b95c42f064 (diff) | |
| download | lwn-341ac5ffc4bd859103899c876902caf07cc97ea4.tar.gz lwn-341ac5ffc4bd859103899c876902caf07cc97ea4.zip | |
libbpf: Support static initialization of BPF_MAP_TYPE_PROG_ARRAY
Support static initialization of BPF_MAP_TYPE_PROG_ARRAY with a
syntax similar to map-in-map initialization ([0]):
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,
},
};
Here's the relevant part of libbpf debug log showing what's
going on with prog-array initialization:
libbpf: sec '.relsocket': collecting relocation for section(3) 'socket'
libbpf: sec '.relsocket': relo #0: insn #2 against 'prog_array_init'
libbpf: prog 'entry': found map 0 (prog_array_init, sec 4, off 0) for insn #0
libbpf: .maps relo #0: for 3 value 0 rel->r_offset 32 name 53 ('tailcall_1')
libbpf: .maps relo #0: map 'prog_array_init' slot [1] points to prog 'tailcall_1'
libbpf: map 'prog_array_init': created successfully, fd=5
libbpf: map 'prog_array_init': slot [1] set to prog 'tailcall_1' fd=6
[0] Closes: https://github.com/libbpf/libbpf/issues/354
Signed-off-by: Hengqi Chen <hengqi.chen@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20211128141633.502339-2-hengqi.chen@gmail.com
Diffstat (limited to 'tools/testing/selftests/bpf/prog_tests/prog_array_init.c')
0 files changed, 0 insertions, 0 deletions