selftests/bpf: Test the update operations for htab of maps

Add test cases to verify the following four update operations on htab of
maps don't trigger lockdep warning:

(1) add then delete
(2) add, overwrite, then delete
(3) add, then lookup_and_delete
(4) add two elements, then lookup_and_delete_batch

Test cases are added for pre-allocated and non-preallocated htab of maps
respectively.

Signed-off-by: Hou Tao <houtao1@huawei.com>
Link: https://lore.kernel.org/r/20241106063542.357743-4-houtao@huaweicloud.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>

diff --git a/tools/testing/selftests/bpf/prog_tests/map_in_map.c b/tools/testing/selftests/bpf/prog_tests/map_in_map.c
index d2a10eb4e5b528854f35d3b9b5a3f99e8c21287d..286a9fb469e273ef69dd6a40e463e125b6fe16ef 100644 (file)
--- a/tools/testing/selftests/bpf/prog_tests/map_in_map.c
+++ b/tools/testing/selftests/bpf/prog_tests/map_in_map.c
@@ -5,7 +5,9 @@
 #include <sys/syscall.h>
 #include <test_progs.h>
 #include <bpf/btf.h>
+
 #include "access_map_in_map.skel.h"
+#include "update_map_in_htab.skel.h"
 
 struct thread_ctx {
        pthread_barrier_t barrier;
@@ -127,6 +129,131 @@ out:
        access_map_in_map__destroy(skel);
 }
 
+static void add_del_fd_htab(int outer_fd)
+{
+       int inner_fd, err;
+       int key = 1;
+
+       inner_fd = bpf_map_create(BPF_MAP_TYPE_ARRAY, "arr1", 4, 4, 1, NULL);
+       if (!ASSERT_OK_FD(inner_fd, "inner1"))
+               return;
+       err = bpf_map_update_elem(outer_fd, &key, &inner_fd, BPF_NOEXIST);
+       close(inner_fd);
+       if (!ASSERT_OK(err, "add"))
+               return;
+
+       /* Delete */
+       err = bpf_map_delete_elem(outer_fd, &key);
+       ASSERT_OK(err, "del");
+}
+
+static void overwrite_fd_htab(int outer_fd)
+{
+       int inner_fd, err;
+       int key = 1;
+
+       inner_fd = bpf_map_create(BPF_MAP_TYPE_ARRAY, "arr1", 4, 4, 1, NULL);
+       if (!ASSERT_OK_FD(inner_fd, "inner1"))
+               return;
+       err = bpf_map_update_elem(outer_fd, &key, &inner_fd, BPF_NOEXIST);
+       close(inner_fd);
+       if (!ASSERT_OK(err, "add"))
+               return;
+
+       /* Overwrite */
+       inner_fd = bpf_map_create(BPF_MAP_TYPE_ARRAY, "arr2", 4, 4, 1, NULL);
+       if (!ASSERT_OK_FD(inner_fd, "inner2"))
+               goto out;
+       err = bpf_map_update_elem(outer_fd, &key, &inner_fd, BPF_EXIST);
+       close(inner_fd);
+       if (!ASSERT_OK(err, "overwrite"))
+               goto out;
+
+       err = bpf_map_delete_elem(outer_fd, &key);
+       ASSERT_OK(err, "del");
+       return;
+out:
+       bpf_map_delete_elem(outer_fd, &key);
+}
+
+static void lookup_delete_fd_htab(int outer_fd)
+{
+       int key = 1, value;
+       int inner_fd, err;
+
+       inner_fd = bpf_map_create(BPF_MAP_TYPE_ARRAY, "arr1", 4, 4, 1, NULL);
+       if (!ASSERT_OK_FD(inner_fd, "inner1"))
+               return;
+       err = bpf_map_update_elem(outer_fd, &key, &inner_fd, BPF_NOEXIST);
+       close(inner_fd);
+       if (!ASSERT_OK(err, "add"))
+               return;
+
+       /* lookup_and_delete is not supported for htab of maps */
+       err = bpf_map_lookup_and_delete_elem(outer_fd, &key, &value);
+       ASSERT_EQ(err, -ENOTSUPP, "lookup_del");
+
+       err = bpf_map_delete_elem(outer_fd, &key);
+       ASSERT_OK(err, "del");
+}
+
+static void batched_lookup_delete_fd_htab(int outer_fd)
+{
+       int keys[2] = {1, 2}, values[2];
+       unsigned int cnt, batch;
+       int inner_fd, err;
+
+       inner_fd = bpf_map_create(BPF_MAP_TYPE_ARRAY, "arr1", 4, 4, 1, NULL);
+       if (!ASSERT_OK_FD(inner_fd, "inner1"))
+               return;
+
+       err = bpf_map_update_elem(outer_fd, &keys[0], &inner_fd, BPF_NOEXIST);
+       close(inner_fd);
+       if (!ASSERT_OK(err, "add1"))
+               return;
+
+       inner_fd = bpf_map_create(BPF_MAP_TYPE_ARRAY, "arr2", 4, 4, 1, NULL);
+       if (!ASSERT_OK_FD(inner_fd, "inner2"))
+               goto out;
+       err = bpf_map_update_elem(outer_fd, &keys[1], &inner_fd, BPF_NOEXIST);
+       close(inner_fd);
+       if (!ASSERT_OK(err, "add2"))
+               goto out;
+
+       /* batched lookup_and_delete */
+       cnt = ARRAY_SIZE(keys);
+       err = bpf_map_lookup_and_delete_batch(outer_fd, NULL, &batch, keys, values, &cnt, NULL);
+       ASSERT_TRUE((!err || err == -ENOENT), "delete_batch ret");
+       ASSERT_EQ(cnt, ARRAY_SIZE(keys), "delete_batch cnt");
+
+out:
+       bpf_map_delete_elem(outer_fd, &keys[0]);
+}
+
+static void test_update_map_in_htab(bool preallocate)
+{
+       struct update_map_in_htab *skel;
+       int err, fd;
+
+       skel = update_map_in_htab__open();
+       if (!ASSERT_OK_PTR(skel, "open"))
+               return;
+
+       err = update_map_in_htab__load(skel);
+       if (!ASSERT_OK(err, "load"))
+               goto out;
+
+       fd = preallocate ? bpf_map__fd(skel->maps.outer_htab_map) :
+                          bpf_map__fd(skel->maps.outer_alloc_htab_map);
+
+       add_del_fd_htab(fd);
+       overwrite_fd_htab(fd);
+       lookup_delete_fd_htab(fd);
+       batched_lookup_delete_fd_htab(fd);
+out:
+       update_map_in_htab__destroy(skel);
+}
+
 void test_map_in_map(void)
 {
        if (test__start_subtest("acc_map_in_array"))
@@ -137,5 +264,8 @@ void test_map_in_map(void)
                test_map_in_map_access("access_map_in_htab", "outer_htab_map");
        if (test__start_subtest("sleepable_acc_map_in_htab"))
                test_map_in_map_access("sleepable_access_map_in_htab", "outer_htab_map");
+       if (test__start_subtest("update_map_in_htab"))
+               test_update_map_in_htab(true);
+       if (test__start_subtest("update_map_in_alloc_htab"))
+               test_update_map_in_htab(false);
 }
-

diff --git a/tools/testing/selftests/bpf/progs/update_map_in_htab.c b/tools/testing/selftests/bpf/progs/update_map_in_htab.c
new file mode 100644 (file)
index 0000000..c206624
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/update_map_in_htab.c
@@ -0,0 +1,30 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (C) 2024. Huawei Technologies Co., Ltd */
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+
+struct inner_map_type {
+       __uint(type, BPF_MAP_TYPE_ARRAY);
+       __uint(key_size, 4);
+       __uint(value_size, 4);
+       __uint(max_entries, 1);
+} inner_map SEC(".maps");
+
+struct {
+       __uint(type, BPF_MAP_TYPE_HASH_OF_MAPS);
+       __type(key, int);
+       __type(value, int);
+       __uint(max_entries, 2);
+       __array(values, struct inner_map_type);
+} outer_htab_map SEC(".maps");
+
+struct {
+       __uint(type, BPF_MAP_TYPE_HASH_OF_MAPS);
+       __uint(map_flags, BPF_F_NO_PREALLOC);
+       __type(key, int);
+       __type(value, int);
+       __uint(max_entries, 2);
+       __array(values, struct inner_map_type);
+} outer_alloc_htab_map SEC(".maps");
+
+char _license[] SEC("license") = "GPL";