[PATCH v2 bpf-next 3/3] bpf: selftests: Add test for different inner map size

[Martin KaFai Lau]

This patch tests the inner map size can be different
for reuseport_sockarray but has to be the same for
arraymap.

Cc: Andrey Ignatov <r...@fb.com>
Signed-off-by: Martin KaFai Lau <ka...@fb.com>
---
 .../selftests/bpf/prog_tests/btf_map_in_map.c | 12 +++++++
 .../selftests/bpf/progs/test_btf_map_in_map.c | 31 +++++++++++++++++++
 2 files changed, 43 insertions(+)

diff --git a/tools/testing/selftests/bpf/prog_tests/btf_map_in_map.c 
b/tools/testing/selftests/bpf/prog_tests/btf_map_in_map.c
index f7ee8fa377ad..7ae767d15608 100644
--- a/tools/testing/selftests/bpf/prog_tests/btf_map_in_map.c
+++ b/tools/testing/selftests/bpf/prog_tests/btf_map_in_map.c
@@ -44,6 +44,18 @@ void test_btf_map_in_map(void)
        bpf_map_lookup_elem(bpf_map__fd(skel->maps.inner_map2), &key, &val);
        CHECK(val != 3, "inner2", "got %d != exp %d\n", val, 3);
 
+       val = bpf_map__fd(skel->maps.sockarr_sz2);
+       err = bpf_map_update_elem(bpf_map__fd(skel->maps.outer_sockarr_sz1),
+                                 &key, &val, 0);
+       CHECK(err, "outer_sockarr inner map size check",
+             "cannot use an inner_map with different size\n");
+
+       val = bpf_map__fd(skel->maps.inner_map_sz2);
+       err = bpf_map_update_elem(bpf_map__fd(skel->maps.outer_arr), &key,
+                                 &val, 0);
+       CHECK(!err, "outer_arr inner map size check",
+             "incorrectly updated with an inner_map in different size\n");
+
 cleanup:
        test_btf_map_in_map__destroy(skel);
 }
diff --git a/tools/testing/selftests/bpf/progs/test_btf_map_in_map.c 
b/tools/testing/selftests/bpf/progs/test_btf_map_in_map.c
index e5093796be97..0b8e04a817f6 100644
--- a/tools/testing/selftests/bpf/progs/test_btf_map_in_map.c
+++ b/tools/testing/selftests/bpf/progs/test_btf_map_in_map.c
@@ -11,6 +11,13 @@ struct inner_map {
 } inner_map1 SEC(".maps"),
   inner_map2 SEC(".maps");
 
+struct inner_map_sz2 {
+       __uint(type, BPF_MAP_TYPE_ARRAY);
+       __uint(max_entries, 2);
+       __type(key, int);
+       __type(value, int);
+} inner_map_sz2 SEC(".maps");
+
 struct outer_arr {
        __uint(type, BPF_MAP_TYPE_ARRAY_OF_MAPS);
        __uint(max_entries, 3);
@@ -50,6 +57,30 @@ struct outer_hash {
        },
 };
 
+struct sockarr_sz1 {
+       __uint(type, BPF_MAP_TYPE_REUSEPORT_SOCKARRAY);
+       __uint(max_entries, 1);
+       __type(key, int);
+       __type(value, int);
+} sockarr_sz1 SEC(".maps");
+
+struct sockarr_sz2 {
+       __uint(type, BPF_MAP_TYPE_REUSEPORT_SOCKARRAY);
+       __uint(max_entries, 2);
+       __type(key, int);
+       __type(value, int);
+} sockarr_sz2 SEC(".maps");
+
+struct outer_sockarr_sz1 {
+       __uint(type, BPF_MAP_TYPE_ARRAY_OF_MAPS);
+       __uint(max_entries, 1);
+       __uint(key_size, sizeof(int));
+       __uint(value_size, sizeof(int));
+       __array(values, struct sockarr_sz1);
+} outer_sockarr_sz1 SEC(".maps") = {
+       .values = { (void *)&sockarr_sz1 },
+};
+
 int input = 0;
 
 SEC("raw_tp/sys_enter")
-- 
2.24.1