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authorQuentin Monnet <quentin@isovalent.com>2021-07-29 19:20:23 +0300
committerAndrii Nakryiko <andrii@kernel.org>2021-07-30 03:09:19 +0300
commit6cc93e2f2c1c865acadedfea174bde893a2aa376 (patch)
treec4fe8a7452fffd58f23357387f21a3427f87d71e /tools/lib
parent3c7e58590600eca3402f08e7fbdf4f2d1e36c5c8 (diff)
downloadlinux-6cc93e2f2c1c865acadedfea174bde893a2aa376.tar.xz
libbpf: Rename btf__get_from_id() as btf__load_from_kernel_by_id()
Rename function btf__get_from_id() as btf__load_from_kernel_by_id() to better indicate what the function does. Change the new function so that, instead of requiring a pointer to the pointer to update and returning with an error code, it takes a single argument (the id of the BTF object) and returns the corresponding pointer. This is more in line with the existing constructors. The other tools calling the (soon-to-be) deprecated btf__get_from_id() function will be updated in a future commit. References: - https://github.com/libbpf/libbpf/issues/278 - https://github.com/libbpf/libbpf/wiki/Libbpf:-the-road-to-v1.0#btfh-apis Signed-off-by: Quentin Monnet <quentin@isovalent.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Acked-by: John Fastabend <john.fastabend@gmail.com> Link: https://lore.kernel.org/bpf/20210729162028.29512-4-quentin@isovalent.com
Diffstat (limited to 'tools/lib')
-rw-r--r--tools/lib/bpf/btf.c25
-rw-r--r--tools/lib/bpf/btf.h4
-rw-r--r--tools/lib/bpf/libbpf.c5
-rw-r--r--tools/lib/bpf/libbpf.map1
4 files changed, 24 insertions, 11 deletions
diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c
index 7e0de560490e..948c29fee447 100644
--- a/tools/lib/bpf/btf.c
+++ b/tools/lib/bpf/btf.c
@@ -1383,21 +1383,30 @@ exit_free:
return btf;
}
-int btf__get_from_id(__u32 id, struct btf **btf)
+struct btf *btf__load_from_kernel_by_id(__u32 id)
{
- struct btf *res;
- int err, btf_fd;
+ struct btf *btf;
+ int btf_fd;
- *btf = NULL;
btf_fd = bpf_btf_get_fd_by_id(id);
if (btf_fd < 0)
- return libbpf_err(-errno);
-
- res = btf_get_from_fd(btf_fd, NULL);
- err = libbpf_get_error(res);
+ return libbpf_err_ptr(-errno);
+ btf = btf_get_from_fd(btf_fd, NULL);
close(btf_fd);
+ return libbpf_ptr(btf);
+}
+
+int btf__get_from_id(__u32 id, struct btf **btf)
+{
+ struct btf *res;
+ int err;
+
+ *btf = NULL;
+ res = btf__load_from_kernel_by_id(id);
+ err = libbpf_get_error(res);
+
if (err)
return libbpf_err(err);
diff --git a/tools/lib/bpf/btf.h b/tools/lib/bpf/btf.h
index fd8a21d936ef..5d955329a1f4 100644
--- a/tools/lib/bpf/btf.h
+++ b/tools/lib/bpf/btf.h
@@ -44,6 +44,9 @@ LIBBPF_API struct btf *btf__parse_elf_split(const char *path, struct btf *base_b
LIBBPF_API struct btf *btf__parse_raw(const char *path);
LIBBPF_API struct btf *btf__parse_raw_split(const char *path, struct btf *base_btf);
+LIBBPF_API struct btf *btf__load_from_kernel_by_id(__u32 id);
+LIBBPF_API int btf__get_from_id(__u32 id, struct btf **btf);
+
LIBBPF_API int btf__finalize_data(struct bpf_object *obj, struct btf *btf);
LIBBPF_API int btf__load(struct btf *btf);
LIBBPF_API int btf__load_into_kernel(struct btf *btf);
@@ -67,7 +70,6 @@ LIBBPF_API void btf__set_fd(struct btf *btf, int fd);
LIBBPF_API const void *btf__get_raw_data(const struct btf *btf, __u32 *size);
LIBBPF_API const char *btf__name_by_offset(const struct btf *btf, __u32 offset);
LIBBPF_API const char *btf__str_by_offset(const struct btf *btf, __u32 offset);
-LIBBPF_API int btf__get_from_id(__u32 id, struct btf **btf);
LIBBPF_API int btf__get_map_kv_tids(const struct btf *btf, const char *map_name,
__u32 expected_key_size,
__u32 expected_value_size,
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 9a657d6d7da3..313883179919 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -8316,7 +8316,7 @@ static int libbpf_find_prog_btf_id(const char *name, __u32 attach_prog_fd)
{
struct bpf_prog_info_linear *info_linear;
struct bpf_prog_info *info;
- struct btf *btf = NULL;
+ struct btf *btf;
int err;
info_linear = bpf_program__get_prog_info_linear(attach_prog_fd, 0);
@@ -8333,7 +8333,8 @@ static int libbpf_find_prog_btf_id(const char *name, __u32 attach_prog_fd)
pr_warn("The target program doesn't have BTF\n");
goto out;
}
- if (btf__get_from_id(info->btf_id, &btf)) {
+ btf = btf__load_from_kernel_by_id(info->btf_id);
+ if (libbpf_get_error(btf)) {
pr_warn("Failed to get BTF of the program\n");
goto out;
}
diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
index 4d80eb8c56b0..3a9c6939301e 100644
--- a/tools/lib/bpf/libbpf.map
+++ b/tools/lib/bpf/libbpf.map
@@ -375,6 +375,7 @@ LIBBPF_0.5.0 {
bpf_map_lookup_and_delete_elem_flags;
bpf_program__attach_kprobe_opts;
bpf_object__gen_loader;
+ btf__load_from_kernel_by_id;
btf__load_into_kernel;
btf_dump__dump_type_data;
libbpf_set_strict_mode;