tools lib bpf: Add bpf_object__pin() (d5148d85) · Commits · 戴 / test

Add a new API to pin a BPF object to the filesystem. The user can specify the path within a BPF filesystem to pin the object. Programs will be pinned under a subdirectory named the same as the program, with each instance appearing as a numbered file under that directory, and maps will be pinned under the path using the name of the map as the file basename. For example, with the directory '/sys/fs/bpf/foo' and a BPF object which contains two instances of a program named 'bar', and a map named 'baz': /sys/fs/bpf/foo/bar/0 /sys/fs/bpf/foo/bar/1 /sys/fs/bpf/foo/baz Signed-off-by:

Joe Stringer <joe@ovn.org> Cc: Alexei Starovoitov <ast@fb.com> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: Wang Nan <wangnan0@huawei.com> Cc: netdev@vger.kernel.org Link: http://lkml.kernel.org/r/20170126212001.14103-4-joe@ovn.org [ Check snprintf >= for truncation, as snprintf(bf, size, ...) == size also means truncation ] Signed-off-by:

Arnaldo Carvalho de Melo <acme@redhat.com>

tools/lib/bpf/libbpf.c

+53 −0

Original line number	Diff line number	Diff line
		@@ -1379,6 +1379,59 @@ int bpf_map__pin(struct bpf_map map, const char path)
		return 0;
		}

		int bpf_object__pin(struct bpf_object obj, const char path)
		{
		struct bpf_program *prog;
		struct bpf_map *map;
		int err;

		if (!obj)
		return -ENOENT;

		if (!obj->loaded) {
		pr_warning("object not yet loaded; load it first\n");
		return -ENOENT;
		}

		err = make_dir(path);
		if (err)
		return err;

		bpf_map__for_each(map, obj) {
		char buf[PATH_MAX];
		int len;

		len = snprintf(buf, PATH_MAX, "%s/%s", path,
		bpf_map__name(map));
		if (len < 0)
		return -EINVAL;
		else if (len >= PATH_MAX)
		return -ENAMETOOLONG;

		err = bpf_map__pin(map, buf);
		if (err)
		return err;
		}

		bpf_object__for_each_program(prog, obj) {
		char buf[PATH_MAX];
		int len;

		len = snprintf(buf, PATH_MAX, "%s/%s", path,
		prog->section_name);
		if (len < 0)
		return -EINVAL;
		else if (len >= PATH_MAX)
		return -ENAMETOOLONG;

		err = bpf_program__pin(prog, buf);
		if (err)
		return err;
		}

		return 0;
		}

		void bpf_object__close(struct bpf_object *obj)
		{
		size_t i;

tools/lib/bpf/libbpf.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -65,6 +65,7 @@ struct bpf_object bpf_object__open(const char path);
		struct bpf_object bpf_object__open_buffer(void obj_buf,
		size_t obj_buf_sz,
		const char *name);
		int bpf_object__pin(struct bpf_object object, const char path);
		void bpf_object__close(struct bpf_object *object);

		/* Load/unload object into/from kernel */

Admin message