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libbpf: Add bpf_link detach APIs 

Add low-level bpf_link_detach() API. Also add higher-level bpf_link__detach()
one.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Song Liu <songliubraving@fb.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20200731182830.286260-3-andriin@fb.com
This commit is contained in:
Andrii Nakryiko 2020-07-31 11:28:27 -07:00 committed by Alexei Starovoitov
parent 73b11c2ab0
commit 2e49527e52
6 changed files with 25 additions and 0 deletions
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5
tools/include/uapi/linux/bpf.h
View File

@ -117,6 +117,7 @@ enum bpf_cmd {
BPF_LINK_GET_NEXT_ID,
BPF_ENABLE_STATS,
BPF_ITER_CREATE,
BPF_LINK_DETACH,
};
enum bpf_map_type {
@ -634,6 +635,10 @@ union bpf_attr {
__u32 old_prog_fd;
} link_update;
struct {
__u32 link_fd;
} link_detach;
struct { /* struct used by BPF_ENABLE_STATS command */
__u32 type;
} enable_stats;

10
tools/lib/bpf/bpf.c
View File

@ -603,6 +603,16 @@ int bpf_link_create(int prog_fd, int target_fd,
return sys_bpf(BPF_LINK_CREATE, &attr, sizeof(attr));
}
int bpf_link_detach(int link_fd)
{
union bpf_attr attr;
memset(&attr, 0, sizeof(attr));
attr.link_detach.link_fd = link_fd;
return sys_bpf(BPF_LINK_DETACH, &attr, sizeof(attr));
}
int bpf_link_update(int link_fd, int new_prog_fd,
const struct bpf_link_update_opts *opts)
{

2
tools/lib/bpf/bpf.h
View File

@ -178,6 +178,8 @@ LIBBPF_API int bpf_link_create(int prog_fd, int target_fd,
enum bpf_attach_type attach_type,
const struct bpf_link_create_opts *opts);
LIBBPF_API int bpf_link_detach(int link_fd);
struct bpf_link_update_opts {
size_t sz; /* size of this struct for forward/backward compatibility */
__u32 flags; /* extra flags */

5
tools/lib/bpf/libbpf.c
View File

@ -7748,6 +7748,11 @@ struct bpf_link *bpf_link__open(const char *path)
return link;
}
int bpf_link__detach(struct bpf_link *link)
{
return bpf_link_detach(link->fd) ? -errno : 0;
}
int bpf_link__pin(struct bpf_link *link, const char *path)
{
int err;

1
tools/lib/bpf/libbpf.h
View File

@ -229,6 +229,7 @@ LIBBPF_API int bpf_link__unpin(struct bpf_link *link);
LIBBPF_API int bpf_link__update_program(struct bpf_link *link,
struct bpf_program *prog);
LIBBPF_API void bpf_link__disconnect(struct bpf_link *link);
LIBBPF_API int bpf_link__detach(struct bpf_link *link);
LIBBPF_API int bpf_link__destroy(struct bpf_link *link);
LIBBPF_API struct bpf_link *

2
tools/lib/bpf/libbpf.map
View File

@ -273,6 +273,8 @@ LIBBPF_0.0.9 {
LIBBPF_0.1.0 {
global:
bpf_link__detach;
bpf_link_detach;
bpf_map__ifindex;
bpf_map__key_size;
bpf_map__map_flags;