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libbpf: Update a bpf_link with another struct_ops.

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Introduce bpf_link__update_map(), which allows to atomically update
underlying struct_ops implementation for given struct_ops BPF link.

Also add old_map_fd to struct bpf_link_update_opts to handle
BPF_F_REPLACE feature.

Signed-off-by: Kui-Feng Lee <kuifeng@meta.com>
Link: https://lore.kernel.org/r/20230323032405.3735486-7-kuifeng@meta.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
This commit is contained in:
Kui-Feng Lee
2023-03-22 20:24:03 -07:00
committed by Andrii Nakryiko
parent 055cbdcc9f
commit e51cdaaca0
5 changed files with 46 additions and 2 deletions
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3
src/bpf.h
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@@ -336,8 +336,9 @@ struct bpf_link_update_opts {
size_t sz; /* size of this struct for forward/backward compatibility */
__u32 flags; /* extra flags */
__u32 old_prog_fd; /* expected old program FD */
__u32 old_map_fd; /* expected old map FD */
};
#define bpf_link_update_opts__last_field old_prog_fd
#define bpf_link_update_opts__last_field old_map_fd
LIBBPF_API int bpf_link_update(int link_fd, int new_prog_fd,
const struct bpf_link_update_opts *opts);