diff options
| author | Rafael David Tinoco <rafaeldtinoco@ubuntu.com> | 2021-03-23 07:09:52 +0300 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2021-03-26 05:23:27 +0300 |
| commit | 155f556d64b1a48710f01305e14bb860734ed1e3 (patch) | |
| tree | 6a719b790128b4142547560041bfc912cc7fe8c4 /tools/lib/bpf | |
| parent | 3ac3f314c325d76deefa34925e11ad52df77cdc3 (diff) | |
| download | linux-155f556d64b1a48710f01305e14bb860734ed1e3.tar.xz | |
libbpf: Add bpf object kern_version attribute setter
Unfortunately some distros don't have their kernel version defined
accurately in <linux/version.h> due to different long term support
reasons.
It is important to have a way to override the bpf kern_version
attribute during runtime: some old kernels might still check for
kern_version attribute during bpf_prog_load().
Signed-off-by: Rafael David Tinoco <rafaeldtinoco@ubuntu.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20210323040952.2118241-1-rafaeldtinoco@ubuntu.com
Diffstat (limited to 'tools/lib/bpf')
| -rw-r--r-- | tools/lib/bpf/libbpf.c | 10 | ||||
| -rw-r--r-- | tools/lib/bpf/libbpf.h | 1 | ||||
| -rw-r--r-- | tools/lib/bpf/libbpf.map | 1 |
3 files changed, 12 insertions, 0 deletions
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index 10a0a67699f1..cebb0e852cf8 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -8270,6 +8270,16 @@ int bpf_object__btf_fd(const struct bpf_object *obj) return obj->btf ? btf__fd(obj->btf) : -1; } +int bpf_object__set_kversion(struct bpf_object *obj, __u32 kern_version) +{ + if (obj->loaded) + return -EINVAL; + + obj->kern_version = kern_version; + + return 0; +} + int bpf_object__set_priv(struct bpf_object *obj, void *priv, bpf_object_clear_priv_t clear_priv) { diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h index 89ade7d7b31c..f500621d28e5 100644 --- a/tools/lib/bpf/libbpf.h +++ b/tools/lib/bpf/libbpf.h @@ -143,6 +143,7 @@ LIBBPF_API int bpf_object__unload(struct bpf_object *obj); LIBBPF_API const char *bpf_object__name(const struct bpf_object *obj); LIBBPF_API unsigned int bpf_object__kversion(const struct bpf_object *obj); +LIBBPF_API int bpf_object__set_kversion(struct bpf_object *obj, __u32 kern_version); struct btf; LIBBPF_API struct btf *bpf_object__btf(const struct bpf_object *obj); diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map index 279ae861f568..f5990f7208ce 100644 --- a/tools/lib/bpf/libbpf.map +++ b/tools/lib/bpf/libbpf.map @@ -359,4 +359,5 @@ LIBBPF_0.4.0 { bpf_linker__finalize; bpf_linker__free; bpf_linker__new; + bpf_object__set_kversion; } LIBBPF_0.3.0; |