bpf: Add tests for map-in-map

Test cases for array of maps and hash of maps.

Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 17 insertions, 0 deletions

diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c
index 207c2eeddab0..9b58d20e8c93 100644
--- a/tools/lib/bpf/bpf.c
+++ b/tools/lib/bpf/bpf.c
@@ -69,6 +69,23 @@ int bpf_create_map(enum bpf_map_type map_type, int key_size,
         return sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr));
 }
 
+int bpf_create_map_in_map(enum bpf_map_type map_type, int key_size,
+                          int inner_map_fd, int max_entries, __u32 map_flags)
+{
+        union bpf_attr attr;
+
+        memset(&attr, '\0', sizeof(attr));
+
+        attr.map_type = map_type;
+        attr.key_size = key_size;
+        attr.value_size = 4;
+        attr.inner_map_fd = inner_map_fd;
+        attr.max_entries = max_entries;
+        attr.map_flags = map_flags;
+
+        return sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr));
+}
+
 int bpf_load_program(enum bpf_prog_type type, const struct bpf_insn *insns,
                      size_t insns_cnt, const char *license,
                      __u32 kern_version, char *log_buf, size_t log_buf_sz)