selftests/bpf: Add a test for using a cpumap from an freplace-to-XDP …

…program

This adds a simple test for inserting an XDP program into a cpumap that is
"owned" by an XDP program that was loaded as PROG_TYPE_EXT (as libxdp
does). Prior to the kernel fix this would fail because the map type
ownership would be set to PROG_TYPE_EXT instead of being resolved to
PROG_TYPE_XDP.

v3:
- Update comment to better explain the cause
- Add Yonghong's ACK

Acked-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>

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

@@ -500,6 +500,61 @@ static void test_fentry_to_cgroup_bpf(void)
 	bind4_prog__destroy(skel);
 }
 
+static void test_func_replace_progmap(void)
+{
+	struct bpf_cpumap_val value = { .qsize = 1 };
+	struct bpf_object *obj, *tgt_obj = NULL;
+	struct bpf_program *drop, *redirect;
+	struct bpf_map *cpumap;
+	int err, tgt_fd;
+	__u32 key = 0;
+
+	err = bpf_prog_test_open("freplace_progmap.bpf.o", BPF_PROG_TYPE_UNSPEC, &obj);
+	if (!ASSERT_OK(err, "prog_open"))
+		return;
+
+	err = bpf_prog_test_load("xdp_dummy.bpf.o", BPF_PROG_TYPE_UNSPEC, &tgt_obj, &tgt_fd);
+	if (!ASSERT_OK(err, "tgt_prog_load"))
+		goto out;
+
+	drop = bpf_object__find_program_by_name(obj, "xdp_drop_prog");
+	redirect = bpf_object__find_program_by_name(obj, "xdp_cpumap_prog");
+	cpumap = bpf_object__find_map_by_name(obj, "cpu_map");
+
+	if (!ASSERT_OK_PTR(drop, "drop") || !ASSERT_OK_PTR(redirect, "redirect") ||
+	    !ASSERT_OK_PTR(cpumap, "cpumap"))
+		goto out;
+
+	/* Change the 'redirect' program type to be a PROG_TYPE_EXT
+	 * with an XDP target
+	 */
+	bpf_program__set_type(redirect, BPF_PROG_TYPE_EXT);
+	bpf_program__set_expected_attach_type(redirect, 0);
+	err = bpf_program__set_attach_target(redirect, tgt_fd, "xdp_dummy_prog");
+	if (!ASSERT_OK(err, "set_attach_target"))
+		goto out;
+
+	err = bpf_object__load(obj);
+	if (!ASSERT_OK(err, "obj_load"))
+		goto out;
+
+	/* Prior to fixing the kernel, loading the PROG_TYPE_EXT 'redirect'
+	 * program above will cause the map owner type of 'cpumap' to be set to
+	 * PROG_TYPE_EXT. This in turn will cause the bpf_map_update_elem()
+	 * below to fail, because the program we are inserting into the map is
+	 * of PROG_TYPE_XDP. After fixing the kernel, the initial ownership will
+	 * be correctly resolved to the *target* of the PROG_TYPE_EXT program
+	 * (i.e., PROG_TYPE_XDP) and the map update will succeed.
+	 */
+	value.bpf_prog.fd = bpf_program__fd(drop);
+	err = bpf_map_update_elem(bpf_map__fd(cpumap), &key, &value, 0);
+	ASSERT_OK(err, "map_update");
+
+out:
+	bpf_object__close(tgt_obj);
+	bpf_object__close(obj);
+}
+
 /* NOTE: affect other tests, must run in serial mode */
 void serial_test_fexit_bpf2bpf(void)
 {
@@ -525,4 +580,6 @@ void serial_test_fexit_bpf2bpf(void)
 		test_func_replace_global_func();
 	if (test__start_subtest("fentry_to_cgroup_bpf"))
 		test_fentry_to_cgroup_bpf();
+	if (test__start_subtest("func_replace_progmap"))
+		test_func_replace_progmap();
 }

tools/testing/selftests/bpf/progs/freplace_progmap.c

@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+
+struct {
+	__uint(type, BPF_MAP_TYPE_CPUMAP);
+	__uint(key_size, sizeof(__u32));
+	__uint(value_size, sizeof(struct bpf_cpumap_val));
+	__uint(max_entries, 1);
+} cpu_map SEC(".maps");
+
+SEC("xdp/cpumap")
+int xdp_drop_prog(struct xdp_md *ctx)
+{
+	return XDP_DROP;
+}
+
+SEC("xdp")
+int xdp_cpumap_prog(struct xdp_md *ctx)
+{
+	return bpf_redirect_map(&cpu_map, 0, XDP_PASS);
+}
+
+char _license[] SEC("license") = "GPL";

tools/testing/selftests/bpf/testing_helpers.c

@@ -174,8 +174,8 @@ __u32 link_info_prog_id(const struct bpf_link *link, struct bpf_link_info *info)
 
 int extra_prog_load_log_flags = 0;
 
-int bpf_prog_test_load(const char *file, enum bpf_prog_type type,
-		       struct bpf_object **pobj, int *prog_fd)
+int bpf_prog_test_open(const char *file, enum bpf_prog_type type,
+		       struct bpf_object **pobj)
 {
 	LIBBPF_OPTS(bpf_object_open_opts, opts,
 		.kernel_log_level = extra_prog_load_log_flags,
@@ -201,6 +201,26 @@ int bpf_prog_test_load(const char *file, enum bpf_prog_type type,
 	flags = bpf_program__flags(prog) | BPF_F_TEST_RND_HI32;
 	bpf_program__set_flags(prog, flags);
 
+	*pobj = obj;
+	return 0;
+err_out:
+	bpf_object__close(obj);
+	return err;
+}
+
+int bpf_prog_test_load(const char *file, enum bpf_prog_type type,
+		       struct bpf_object **pobj, int *prog_fd)
+{
+	struct bpf_program *prog;
+	struct bpf_object *obj;
+	int err;
+
+	err = bpf_prog_test_open(file, type, &obj);
+	if (err)
+		return err;
+
+	prog = bpf_object__next_program(obj, NULL);
+
 	err = bpf_object__load(obj);
 	if (err)
 		goto err_out;

tools/testing/selftests/bpf/testing_helpers.h

@@ -6,6 +6,8 @@
 
 int parse_num_list(const char *s, bool **set, int *set_len);
 __u32 link_info_prog_id(const struct bpf_link *link, struct bpf_link_info *info);
+int bpf_prog_test_open(const char *file, enum bpf_prog_type type,
+		       struct bpf_object **pobj);
 int bpf_prog_test_load(const char *file, enum bpf_prog_type type,
 		       struct bpf_object **pobj, int *prog_fd);
 int bpf_test_load_program(enum bpf_prog_type type, const struct bpf_insn *insns,