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libbpf: Find correct module BTFs for struct_ops maps and progs.

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Locate the module BTFs for struct_ops maps and progs and pass them to the
kernel. This ensures that the kernel correctly resolves type IDs from the
appropriate module BTFs.

For the map of a struct_ops object, the FD of the module BTF is set to
bpf_map to keep a reference to the module BTF. The FD is passed to the
kernel as value_type_btf_obj_fd when the struct_ops object is loaded.

For a bpf_struct_ops prog, attach_btf_obj_fd of bpf_prog is the FD of a
module BTF in the kernel.

Signed-off-by: Kui-Feng Lee <thinker.li@gmail.com>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20240119225005.668602-13-thinker.li@gmail.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
This commit is contained in:
Kui-Feng Lee
2024-01-19 14:50:03 -08:00
committed by Andrii Nakryiko
parent d767ead51f
commit 0b0dfaf1be
4 changed files with 38 additions and 12 deletions
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4
src/bpf.h
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@@ -51,8 +51,10 @@ struct bpf_map_create_opts {
__u32 numa_node;
__u32 map_ifindex;
__s32 value_type_btf_obj_fd;
size_t:0;
};
#define bpf_map_create_opts__last_field map_ifindex
#define bpf_map_create_opts__last_field value_type_btf_obj_fd
LIBBPF_API int bpf_map_create(enum bpf_map_type map_type,
const char *map_name,