Merge branch 'libbpf: Deprecate bpf_{map,program}__{prev,next} APIs since v0.7'

Hengqi Chen says:

====================

bpf_{map,program}__{prev,next} don't follow the libbpf API naming
convention. Deprecate them and replace them with a new set of APIs
named bpf_object__{prev,next}_{program,map}.

v1->v2: [0]
  * Addressed Andrii's comments

  [0]: https://patchwork.kernel.org/project/netdevbpf/patch/20210906165456.325999-1-hengqi.chen@gmail.com/
====================

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>

samples/bpf/xdp1_user.c

@@ -128,7 +128,7 @@ int main(int argc, char **argv)
 	if (bpf_prog_load_xattr(&prog_load_attr, &obj, &prog_fd))
 		return 1;
 
-	map = bpf_map__next(NULL, obj);
+	map = bpf_object__next_map(obj, NULL);
 	if (!map) {
 		printf("finding a map in obj file failed\n");
 		return 1;

samples/bpf/xdp_sample_pkts_user.c

@@ -154,7 +154,7 @@ int main(int argc, char **argv)
 		return 1;
 	}
 
-	map = bpf_map__next(NULL, obj);
+	map = bpf_object__next_map(obj, NULL);
 	if (!map) {
 		printf("finding a map in obj file failed\n");
 		return 1;

tools/bpf/bpftool/iter.c

@@ -57,7 +57,7 @@ static int do_pin(int argc, char **argv)
 		goto close_obj;
 	}
 
-	prog = bpf_program__next(NULL, obj);
+	prog = bpf_object__next_program(obj, NULL);
 	if (!prog) {
 		p_err("can't find bpf program in objfile %s", objfile);
 		goto close_obj;

tools/bpf/bpftool/prog.c

@@ -1601,7 +1601,7 @@ static int load_with_options(int argc, char **argv, bool first_prog_only)
 		goto err_close_obj;
 
 	if (first_prog_only) {
-		prog = bpf_program__next(NULL, obj);
+		prog = bpf_object__next_program(obj, NULL);
 		if (!prog) {
 			p_err("object file doesn't contain any bpf program");
 			goto err_close_obj;

tools/lib/bpf/libbpf.c

@@ -7834,6 +7834,12 @@ __bpf_program__iter(const struct bpf_program *p, const struct bpf_object *obj,
 
 struct bpf_program *
 bpf_program__next(struct bpf_program *prev, const struct bpf_object *obj)
+{
+	return bpf_object__next_program(obj, prev);
+}
+
+struct bpf_program *
+bpf_object__next_program(const struct bpf_object *obj, struct bpf_program *prev)
 {
 	struct bpf_program *prog = prev;
 
@@ -7846,6 +7852,12 @@ bpf_program__next(struct bpf_program *prev, const struct bpf_object *obj)
 
 struct bpf_program *
 bpf_program__prev(struct bpf_program *next, const struct bpf_object *obj)
+{
+	return bpf_object__prev_program(obj, next);
+}
+
+struct bpf_program *
+bpf_object__prev_program(const struct bpf_object *obj, struct bpf_program *next)
 {
 	struct bpf_program *prog = next;
 
@@ -8778,6 +8790,12 @@ __bpf_map__iter(const struct bpf_map *m, const struct bpf_object *obj, int i)
 
 struct bpf_map *
 bpf_map__next(const struct bpf_map *prev, const struct bpf_object *obj)
+{
+	return bpf_object__next_map(obj, prev);
+}
+
+struct bpf_map *
+bpf_object__next_map(const struct bpf_object *obj, const struct bpf_map *prev)
 {
 	if (prev == NULL)
 		return obj->maps;
@@ -8787,6 +8805,12 @@ bpf_map__next(const struct bpf_map *prev, const struct bpf_object *obj)
 
 struct bpf_map *
 bpf_map__prev(const struct bpf_map *next, const struct bpf_object *obj)
+{
+	return bpf_object__prev_map(obj, next);
+}
+
+struct bpf_map *
+bpf_object__prev_map(const struct bpf_object *obj, const struct bpf_map *next)
 {
 	if (next == NULL) {
 		if (!obj->nr_maps)

tools/lib/bpf/libbpf.h

@@ -190,16 +190,22 @@ LIBBPF_API int libbpf_find_vmlinux_btf_id(const char *name,
 
 /* Accessors of bpf_program */
 struct bpf_program;
-LIBBPF_API struct bpf_program *bpf_program__next(struct bpf_program *prog,
-						 const struct bpf_object *obj);
+LIBBPF_API LIBBPF_DEPRECATED_SINCE(0, 7, "use bpf_object__next_program() instead")
+struct bpf_program *bpf_program__next(struct bpf_program *prog,
+				      const struct bpf_object *obj);
+LIBBPF_API struct bpf_program *
+bpf_object__next_program(const struct bpf_object *obj, struct bpf_program *prog);
 
-#define bpf_object__for_each_program(pos, obj)		\
-	for ((pos) = bpf_program__next(NULL, (obj));	\
-	     (pos) != NULL;				\
-	     (pos) = bpf_program__next((pos), (obj)))
+#define bpf_object__for_each_program(pos, obj)			\
+	for ((pos) = bpf_object__next_program((obj), NULL);	\
+	     (pos) != NULL;					\
+	     (pos) = bpf_object__next_program((obj), (pos)))
 
-LIBBPF_API struct bpf_program *bpf_program__prev(struct bpf_program *prog,
-						 const struct bpf_object *obj);
+LIBBPF_API LIBBPF_DEPRECATED_SINCE(0, 7, "use bpf_object__prev_program() instead")
+struct bpf_program *bpf_program__prev(struct bpf_program *prog,
+				      const struct bpf_object *obj);
+LIBBPF_API struct bpf_program *
+bpf_object__prev_program(const struct bpf_object *obj, struct bpf_program *prog);
 
 typedef void (*bpf_program_clear_priv_t)(struct bpf_program *, void *);
 
@@ -503,16 +509,21 @@ bpf_object__find_map_fd_by_name(const struct bpf_object *obj, const char *name);
 LIBBPF_API struct bpf_map *
 bpf_object__find_map_by_offset(struct bpf_object *obj, size_t offset);
 
+LIBBPF_API LIBBPF_DEPRECATED_SINCE(0, 7, "use bpf_object__next_map() instead")
+struct bpf_map *bpf_map__next(const struct bpf_map *map, const struct bpf_object *obj);
 LIBBPF_API struct bpf_map *
-bpf_map__next(const struct bpf_map *map, const struct bpf_object *obj);
+bpf_object__next_map(const struct bpf_object *obj, const struct bpf_map *map);
+
 #define bpf_object__for_each_map(pos, obj)		\
-	for ((pos) = bpf_map__next(NULL, (obj));	\
+	for ((pos) = bpf_object__next_map((obj), NULL);	\
 	     (pos) != NULL;				\
-	     (pos) = bpf_map__next((pos), (obj)))
+	     (pos) = bpf_object__next_map((obj), (pos)))
 #define bpf_map__for_each bpf_object__for_each_map
 
+LIBBPF_API LIBBPF_DEPRECATED_SINCE(0, 7, "use bpf_object__prev_map() instead")
+struct bpf_map *bpf_map__prev(const struct bpf_map *map, const struct bpf_object *obj);
 LIBBPF_API struct bpf_map *
-bpf_map__prev(const struct bpf_map *map, const struct bpf_object *obj);
+bpf_object__prev_map(const struct bpf_object *obj, const struct bpf_map *map);
 
 /**
  * @brief **bpf_map__fd()** gets the file descriptor of the passed

tools/lib/bpf/libbpf.map

@@ -389,6 +389,10 @@ LIBBPF_0.5.0 {
 
 LIBBPF_0.6.0 {
 	global:
+		bpf_object__next_map;
+		bpf_object__next_program;
+		bpf_object__prev_map;
+		bpf_object__prev_program;
 		btf__add_btf;
 		btf__add_tag;
 } LIBBPF_0.5.0;

tools/testing/selftests/bpf/prog_tests/btf.c

@@ -4511,7 +4511,7 @@ static void do_test_file(unsigned int test_num)
 	if (CHECK(err, "obj: %d", err))
 		return;
 
-	prog = bpf_program__next(NULL, obj);
+	prog = bpf_object__next_program(obj, NULL);
 	if (CHECK(!prog, "Cannot find bpf_prog")) {
 		err = -1;
 		goto done;

tools/testing/selftests/bpf/prog_tests/fexit_bpf2bpf.c

@@ -285,7 +285,7 @@ static void test_fmod_ret_freplace(void)
 	if (!ASSERT_OK_PTR(freplace_obj, "freplace_obj_open"))
 		goto out;
 
-	prog = bpf_program__next(NULL, freplace_obj);
+	prog = bpf_object__next_program(freplace_obj, NULL);
 	err = bpf_program__set_attach_target(prog, pkt_fd, NULL);
 	ASSERT_OK(err, "freplace__set_attach_target");
 
@@ -302,7 +302,7 @@ static void test_fmod_ret_freplace(void)
 		goto out;
 
 	attach_prog_fd = bpf_program__fd(prog);
-	prog = bpf_program__next(NULL, fmod_obj);
+	prog = bpf_object__next_program(fmod_obj, NULL);
 	err = bpf_program__set_attach_target(prog, attach_prog_fd, NULL);
 	ASSERT_OK(err, "fmod_ret_set_attach_target");
 
@@ -352,7 +352,7 @@ static void test_obj_load_failure_common(const char *obj_file,
 	if (!ASSERT_OK_PTR(obj, "obj_open"))
 		goto close_prog;
 
-	prog = bpf_program__next(NULL, obj);
+	prog = bpf_object__next_program(obj, NULL);
 	err = bpf_program__set_attach_target(prog, pkt_fd, NULL);
 	ASSERT_OK(err, "set_attach_target");
 

tools/testing/selftests/bpf/prog_tests/select_reuseport.c

@@ -114,7 +114,7 @@ static int prepare_bpf_obj(void)
 	err = bpf_object__load(obj);
 	RET_ERR(err, "load bpf_object", "err:%d\n", err);
 
-	prog = bpf_program__next(NULL, obj);
+	prog = bpf_object__next_program(obj, NULL);
 	RET_ERR(!prog, "get first bpf_program", "!prog\n");
 	select_by_skb_data_prog = bpf_program__fd(prog);
 	RET_ERR(select_by_skb_data_prog < 0, "get prog fd",

tools/testing/selftests/bpf/prog_tests/tcp_rtt.c

@@ -109,7 +109,7 @@ static int run_test(int cgroup_fd, int server_fd)
 		return -1;
 	}
 
-	map = bpf_map__next(NULL, obj);
+	map = bpf_object__next_map(obj, NULL);
 	map_fd = bpf_map__fd(map);
 
 	err = bpf_prog_attach(prog_fd, cgroup_fd, BPF_CGROUP_SOCK_OPS, 0);

tools/testing/selftests/bpf/xdping.c

@@ -187,7 +187,7 @@ int main(int argc, char **argv)
 		return 1;
 	}
 
-	map = bpf_map__next(NULL, obj);
+	map = bpf_object__next_map(obj, NULL);
 	if (map)
 		map_fd = bpf_map__fd(map);
 	if (!map || map_fd < 0) {