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Message-Id: <20210914123750.460750-5-memxor@gmail.com>
Date: Tue, 14 Sep 2021 18:07:43 +0530
From: Kumar Kartikeya Dwivedi <memxor@...il.com>
To: bpf@...r.kernel.org
Cc: Kumar Kartikeya Dwivedi <memxor@...il.com>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Andrii Nakryiko <andrii@...nel.org>,
Martin KaFai Lau <kafai@...com>,
Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
Jesper Dangaard Brouer <brouer@...hat.com>,
Toke Høiland-Jørgensen <toke@...hat.com>,
netdev@...r.kernel.org
Subject: [PATCH bpf-next v2 04/10] tools: Allow specifying base BTF file in resolve_btfids
This commits allows specifying the base BTF for resolving btf id
lists/sets during link time in the resolve_btfids tool. The base BTF is
set to NULL if no path is passed. This allows resolving BTF ids for
module kernel objects.
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@...il.com>
---
tools/bpf/resolve_btfids/main.c | 19 +++++++++++++++++--
1 file changed, 17 insertions(+), 2 deletions(-)
diff --git a/tools/bpf/resolve_btfids/main.c b/tools/bpf/resolve_btfids/main.c
index de6365b53c9c..206e1120082f 100644
--- a/tools/bpf/resolve_btfids/main.c
+++ b/tools/bpf/resolve_btfids/main.c
@@ -89,6 +89,7 @@ struct btf_id {
struct object {
const char *path;
const char *btf;
+ const char *base_btf_path;
struct {
int fd;
@@ -477,16 +478,27 @@ static int symbols_resolve(struct object *obj)
int nr_structs = obj->nr_structs;
int nr_unions = obj->nr_unions;
int nr_funcs = obj->nr_funcs;
+ struct btf *base_btf = NULL;
int err, type_id;
struct btf *btf;
__u32 nr_types;
- btf = btf__parse(obj->btf ?: obj->path, NULL);
+ if (obj->base_btf_path) {
+ base_btf = btf__parse(obj->base_btf_path, NULL);
+ err = libbpf_get_error(base_btf);
+ if (err) {
+ pr_err("FAILED: load base BTF from %s: %s\n",
+ obj->base_btf_path, strerror(-err));
+ return -1;
+ }
+ }
+
+ btf = btf__parse_split(obj->btf ?: obj->path, base_btf);
err = libbpf_get_error(btf);
if (err) {
pr_err("FAILED: load BTF from %s: %s\n",
obj->btf ?: obj->path, strerror(-err));
- return -1;
+ goto out;
}
err = -1;
@@ -545,6 +557,7 @@ static int symbols_resolve(struct object *obj)
err = 0;
out:
+ btf__free(base_btf);
btf__free(btf);
return err;
}
@@ -697,6 +710,8 @@ int main(int argc, const char **argv)
"BTF data"),
OPT_BOOLEAN(0, "no-fail", &no_fail,
"do not fail if " BTF_IDS_SECTION " section is not found"),
+ OPT_STRING('s', "base-btf", &obj.base_btf_path, "file",
+ "path of file providing base BTF data"),
OPT_END()
};
int err = -1;
--
2.33.0
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