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libbpf: Add support for associating BPF program with struct_ops

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Add low-level wrapper and libbpf API for BPF_PROG_ASSOC_STRUCT_OPS
command in the bpf() syscall.

Signed-off-by: Amery Hung <ameryhung@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20251203233748.668365-4-ameryhung@gmail.com
This commit is contained in:
Amery Hung
2025-12-03 15:37:45 -08:00
committed by Andrii Nakryiko
parent 1a41b12b4f
commit 5635185147
5 changed files with 89 additions and 0 deletions
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31
src/libbpf.c
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@@ -14133,6 +14133,37 @@ int bpf_program__set_attach_target(struct bpf_program *prog,
return 0;
}
int bpf_program__assoc_struct_ops(struct bpf_program *prog, struct bpf_map *map,
struct bpf_prog_assoc_struct_ops_opts *opts)
{
int prog_fd, map_fd;
prog_fd = bpf_program__fd(prog);
if (prog_fd < 0) {
pr_warn("prog '%s': can't associate BPF program without FD (was it loaded?)\n",
prog->name);
return libbpf_err(-EINVAL);
}
if (prog->type == BPF_PROG_TYPE_STRUCT_OPS) {
pr_warn("prog '%s': can't associate struct_ops program\n", prog->name);
return libbpf_err(-EINVAL);
}
map_fd = bpf_map__fd(map);
if (map_fd < 0) {
pr_warn("map '%s': can't associate BPF map without FD (was it created?)\n", map->name);
return libbpf_err(-EINVAL);
}
if (!bpf_map__is_struct_ops(map)) {
pr_warn("map '%s': can't associate non-struct_ops map\n", map->name);
return libbpf_err(-EINVAL);
}
return bpf_prog_assoc_struct_ops(prog_fd, map_fd, opts);
}
int parse_cpu_mask_str(const char *s, bool **mask, int *mask_sz)
{
int err = 0, n, len, start, end = -1;