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Message-Id: <20210721153808.6902-4-quentin@isovalent.com>
Date: Wed, 21 Jul 2021 16:38:06 +0100
From: Quentin Monnet <quentin@...valent.com>
To: Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Andrii Nakryiko <andrii@...nel.org>
Cc: netdev@...r.kernel.org, bpf@...r.kernel.org,
Quentin Monnet <quentin@...valent.com>,
John Fastabend <john.fastabend@...il.com>
Subject: [PATCH bpf-next v2 3/5] tools: replace btf__get_from_id() with btf__load_from_kernel_by_id()
Replace the calls to deprecated function btf__get_from_id() with calls
to btf__load_from_kernel_by_id() in tools/ (bpftool, perf, selftests).
Update the surrounding code accordingly (instead of passing a pointer to
the btf struct, get it as a return value from the function). Also make
sure that btf__free() is called on the pointer after use.
v2:
- Given that btf__load_from_kernel_by_id() has changed since v1, adapt
the code accordingly instead of just renaming the function. Also add a
few calls to btf__free() when necessary.
Signed-off-by: Quentin Monnet <quentin@...valent.com>
Acked-by: John Fastabend <john.fastabend@...il.com>
---
tools/bpf/bpftool/btf.c | 8 ++----
tools/bpf/bpftool/btf_dumper.c | 6 ++--
tools/bpf/bpftool/map.c | 16 +++++------
tools/bpf/bpftool/prog.c | 29 ++++++++++++++------
tools/perf/util/bpf-event.c | 11 ++++----
tools/perf/util/bpf_counter.c | 12 ++++++--
tools/testing/selftests/bpf/prog_tests/btf.c | 4 ++-
7 files changed, 51 insertions(+), 35 deletions(-)
diff --git a/tools/bpf/bpftool/btf.c b/tools/bpf/bpftool/btf.c
index 385d5c955cf3..9162a18e84c0 100644
--- a/tools/bpf/bpftool/btf.c
+++ b/tools/bpf/bpftool/btf.c
@@ -580,16 +580,12 @@ static int do_dump(int argc, char **argv)
}
if (!btf) {
- err = btf__get_from_id(btf_id, &btf);
+ btf = btf__load_from_kernel_by_id(btf_id);
+ err = libbpf_get_error(btf);
if (err) {
p_err("get btf by id (%u): %s", btf_id, strerror(err));
goto done;
}
- if (!btf) {
- err = -ENOENT;
- p_err("can't find btf with ID (%u)", btf_id);
- goto done;
- }
}
if (dump_c) {
diff --git a/tools/bpf/bpftool/btf_dumper.c b/tools/bpf/bpftool/btf_dumper.c
index 7ca54d046362..9c25286a5c73 100644
--- a/tools/bpf/bpftool/btf_dumper.c
+++ b/tools/bpf/bpftool/btf_dumper.c
@@ -64,8 +64,10 @@ static int dump_prog_id_as_func_ptr(const struct btf_dumper *d,
}
info = &prog_info->info;
- if (!info->btf_id || !info->nr_func_info ||
- btf__get_from_id(info->btf_id, &prog_btf))
+ if (!info->btf_id || !info->nr_func_info)
+ goto print;
+ prog_btf = btf__load_from_kernel_by_id(info->btf_id);
+ if (libbpf_get_error(prog_btf))
goto print;
finfo = u64_to_ptr(info->func_info);
func_type = btf__type_by_id(prog_btf, finfo->type_id);
diff --git a/tools/bpf/bpftool/map.c b/tools/bpf/bpftool/map.c
index 09ae0381205b..12787758ce03 100644
--- a/tools/bpf/bpftool/map.c
+++ b/tools/bpf/bpftool/map.c
@@ -805,12 +805,11 @@ static struct btf *get_map_kv_btf(const struct bpf_map_info *info)
}
return btf_vmlinux;
} else if (info->btf_value_type_id) {
- int err;
-
- err = btf__get_from_id(info->btf_id, &btf);
- if (err || !btf) {
+ btf = btf__load_from_kernel_by_id(info->btf_id);
+ if (libbpf_get_error(btf)) {
p_err("failed to get btf");
- btf = err ? ERR_PTR(err) : ERR_PTR(-ESRCH);
+ if (!btf)
+ btf = ERR_PTR(-ESRCH);
}
}
@@ -1039,11 +1038,10 @@ static void print_key_value(struct bpf_map_info *info, void *key,
void *value)
{
json_writer_t *btf_wtr;
- struct btf *btf = NULL;
- int err;
+ struct btf *btf;
- err = btf__get_from_id(info->btf_id, &btf);
- if (err) {
+ btf = btf__load_from_kernel_by_id(info->btf_id);
+ if (libbpf_get_error(btf)) {
p_err("failed to get btf");
return;
}
diff --git a/tools/bpf/bpftool/prog.c b/tools/bpf/bpftool/prog.c
index cc48726740ad..b1996b8f1d42 100644
--- a/tools/bpf/bpftool/prog.c
+++ b/tools/bpf/bpftool/prog.c
@@ -249,10 +249,10 @@ static void show_prog_metadata(int fd, __u32 num_maps)
struct bpf_map_info map_info;
struct btf_var_secinfo *vsi;
bool printed_header = false;
- struct btf *btf = NULL;
unsigned int i, vlen;
void *value = NULL;
const char *name;
+ struct btf *btf;
int err;
if (!num_maps)
@@ -263,8 +263,8 @@ static void show_prog_metadata(int fd, __u32 num_maps)
if (!value)
return;
- err = btf__get_from_id(map_info.btf_id, &btf);
- if (err || !btf)
+ btf = btf__load_from_kernel_by_id(map_info.btf_id);
+ if (libbpf_get_error(btf))
goto out_free;
t_datasec = btf__type_by_id(btf, map_info.btf_value_type_id);
@@ -646,9 +646,12 @@ prog_dump(struct bpf_prog_info *info, enum dump_mode mode,
member_len = info->xlated_prog_len;
}
- if (info->btf_id && btf__get_from_id(info->btf_id, &btf)) {
- p_err("failed to get btf");
- return -1;
+ if (info->btf_id) {
+ btf = btf__load_from_kernel_by_id(info->btf_id);
+ if (libbpf_get_error(btf)) {
+ p_err("failed to get btf");
+ return -1;
+ }
}
func_info = u64_to_ptr(info->func_info);
@@ -781,6 +784,8 @@ prog_dump(struct bpf_prog_info *info, enum dump_mode mode,
kernel_syms_destroy(&dd);
}
+ btf__free(btf);
+
return 0;
}
@@ -2002,8 +2007,8 @@ static char *profile_target_name(int tgt_fd)
struct bpf_prog_info_linear *info_linear;
struct bpf_func_info *func_info;
const struct btf_type *t;
+ struct btf *btf = NULL;
char *name = NULL;
- struct btf *btf;
info_linear = bpf_program__get_prog_info_linear(
tgt_fd, 1UL << BPF_PROG_INFO_FUNC_INFO);
@@ -2012,12 +2017,17 @@ static char *profile_target_name(int tgt_fd)
return NULL;
}
- if (info_linear->info.btf_id == 0 ||
- btf__get_from_id(info_linear->info.btf_id, &btf)) {
+ if (info_linear->info.btf_id == 0) {
p_err("prog FD %d doesn't have valid btf", tgt_fd);
goto out;
}
+ btf = btf__load_from_kernel_by_id(info_linear->info.btf_id);
+ if (libbpf_get_error(btf)) {
+ p_err("failed to load btf for prog FD %d", tgt_fd);
+ goto out;
+ }
+
func_info = u64_to_ptr(info_linear->info.func_info);
t = btf__type_by_id(btf, func_info[0].type_id);
if (!t) {
@@ -2027,6 +2037,7 @@ static char *profile_target_name(int tgt_fd)
}
name = strdup(btf__name_by_offset(btf, t->name_off));
out:
+ btf__free(btf);
free(info_linear);
return name;
}
diff --git a/tools/perf/util/bpf-event.c b/tools/perf/util/bpf-event.c
index cdecda1ddd36..996d025b8ed8 100644
--- a/tools/perf/util/bpf-event.c
+++ b/tools/perf/util/bpf-event.c
@@ -223,10 +223,10 @@ static int perf_event__synthesize_one_bpf_prog(struct perf_session *session,
free(info_linear);
return -1;
}
- 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_debug("%s: failed to get BTF of id %u, aborting\n", __func__, info->btf_id);
err = -1;
- btf = NULL;
goto out;
}
perf_env__fetch_btf(env, info->btf_id, btf);
@@ -296,7 +296,7 @@ static int perf_event__synthesize_one_bpf_prog(struct perf_session *session,
out:
free(info_linear);
- free(btf);
+ btf__free(btf);
return err ? -1 : 0;
}
@@ -478,7 +478,8 @@ static void perf_env__add_bpf_info(struct perf_env *env, u32 id)
if (btf_id == 0)
goto out;
- if (btf__get_from_id(btf_id, &btf)) {
+ btf = btf__load_from_kernel_by_id(btf_id);
+ if (libbpf_get_error(btf)) {
pr_debug("%s: failed to get BTF of id %u, aborting\n",
__func__, btf_id);
goto out;
@@ -486,7 +487,7 @@ static void perf_env__add_bpf_info(struct perf_env *env, u32 id)
perf_env__fetch_btf(env, btf_id, btf);
out:
- free(btf);
+ btf__free(btf);
close(fd);
}
diff --git a/tools/perf/util/bpf_counter.c b/tools/perf/util/bpf_counter.c
index 8150e03367bb..ba0f20853651 100644
--- a/tools/perf/util/bpf_counter.c
+++ b/tools/perf/util/bpf_counter.c
@@ -64,8 +64,8 @@ static char *bpf_target_prog_name(int tgt_fd)
struct bpf_prog_info_linear *info_linear;
struct bpf_func_info *func_info;
const struct btf_type *t;
+ struct btf *btf = NULL;
char *name = NULL;
- struct btf *btf;
info_linear = bpf_program__get_prog_info_linear(
tgt_fd, 1UL << BPF_PROG_INFO_FUNC_INFO);
@@ -74,12 +74,17 @@ static char *bpf_target_prog_name(int tgt_fd)
return NULL;
}
- if (info_linear->info.btf_id == 0 ||
- btf__get_from_id(info_linear->info.btf_id, &btf)) {
+ if (info_linear->info.btf_id == 0) {
pr_debug("prog FD %d doesn't have valid btf\n", tgt_fd);
goto out;
}
+ btf = btf__load_from_kernel_by_id(info_linear->info.btf_id);
+ if (libbpf_get_error(btf)) {
+ pr_debug("failed to load btf for prog FD %d\n", tgt_fd);
+ goto out;
+ }
+
func_info = u64_to_ptr(info_linear->info.func_info);
t = btf__type_by_id(btf, func_info[0].type_id);
if (!t) {
@@ -89,6 +94,7 @@ static char *bpf_target_prog_name(int tgt_fd)
}
name = strdup(btf__name_by_offset(btf, t->name_off));
out:
+ btf__free(btf);
free(info_linear);
return name;
}
diff --git a/tools/testing/selftests/bpf/prog_tests/btf.c b/tools/testing/selftests/bpf/prog_tests/btf.c
index 857e3f26086f..649f87382c8d 100644
--- a/tools/testing/selftests/bpf/prog_tests/btf.c
+++ b/tools/testing/selftests/bpf/prog_tests/btf.c
@@ -4350,7 +4350,8 @@ static void do_test_file(unsigned int test_num)
goto done;
}
- err = btf__get_from_id(info.btf_id, &btf);
+ btf = btf__load_from_kernel_by_id(info.btf_id);
+ err = libbpf_get_error(btf);
if (CHECK(err, "cannot get btf from kernel, err: %d", err))
goto done;
@@ -4386,6 +4387,7 @@ static void do_test_file(unsigned int test_num)
fprintf(stderr, "OK");
done:
+ btf__free(btf);
free(func_info);
bpf_object__close(obj);
}
--
2.30.2
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