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bpf: Update the struct_ops of a bpf_link.

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By improving the BPF_LINK_UPDATE command of bpf(), it should allow you
to conveniently switch between different struct_ops on a single
bpf_link. This would enable smoother transitions from one struct_ops
to another.

The struct_ops maps passing along with BPF_LINK_UPDATE should have the
BPF_F_LINK flag.

Signed-off-by: Kui-Feng Lee <kuifeng@meta.com>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20230323032405.3735486-6-kuifeng@meta.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
This commit is contained in:
Kui-Feng Lee 2023-03-22 20:24:02 -07:00 • committed by Martin KaFai Lau
parent 8d1608d709
commit aef56f2e91
6 changed files with 122 additions and 11 deletions
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3
include/linux/bpf.h
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@ -1476,6 +1476,8 @@ struct bpf_link_ops {
void (*show_fdinfo)(const struct bpf_link *link, struct seq_file *seq);
int (*fill_link_info)(const struct bpf_link *link,
struct bpf_link_info *info);
int (*update_map)(struct bpf_link *link, struct bpf_map *new_map,
struct bpf_map *old_map);
};
struct bpf_tramp_link {
@ -1518,6 +1520,7 @@ struct bpf_struct_ops {
void *kdata, const void *udata);
int (*reg)(void *kdata);
void (*unreg)(void *kdata);
int (*update)(void *kdata, void *old_kdata);
int (*validate)(void *kdata);
const struct btf_type *type;
const struct btf_type *value_type;