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bpf: adding tests for map_in_map helpber in libbpf

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adding test/example of bpf_map__set_inner_map_fd usage

Signed-off-by: Nikita V. Shirokov <tehnerd@tehnerd.com>
Acked-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Nikita V. Shirokov 2018-11-20 20:55:57 -08:00 committed by Daniel Borkmann
parent addb9fc90f
commit b1957c92eb
3 changed files with 141 additions and 1 deletions
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3
tools/testing/selftests/bpf/Makefile
View file

@ -38,7 +38,8 @@ TEST_GEN_FILES = test_pkt_access.o test_xdp.o test_l4lb.o test_tcp_estats.o test
test_lwt_seg6local.o sendmsg4_prog.o sendmsg6_prog.o test_lirc_mode2_kern.o \
get_cgroup_id_kern.o socket_cookie_prog.o test_select_reuseport_kern.o \
test_skb_cgroup_id_kern.o bpf_flow.o netcnt_prog.o \
test_sk_lookup_kern.o test_xdp_vlan.o test_queue_map.o test_stack_map.o
test_sk_lookup_kern.o test_xdp_vlan.o test_queue_map.o test_stack_map.o \
test_map_in_map.o
# Order correspond to 'make run_tests' order
TEST_PROGS := test_kmod.sh \

49
tools/testing/selftests/bpf/test_map_in_map.c Normal file
View file

@ -0,0 +1,49 @@
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2018 Facebook */
#include <stddef.h>
#include <linux/bpf.h>
#include <linux/types.h>
#include "bpf_helpers.h"
struct bpf_map_def SEC("maps") mim_array = {
.type = BPF_MAP_TYPE_ARRAY_OF_MAPS,
.key_size = sizeof(int),
/* must be sizeof(__u32) for map in map */
.value_size = sizeof(__u32),
.max_entries = 1,
.map_flags = 0,
};
struct bpf_map_def SEC("maps") mim_hash = {
.type = BPF_MAP_TYPE_HASH_OF_MAPS,
.key_size = sizeof(int),
/* must be sizeof(__u32) for map in map */
.value_size = sizeof(__u32),
.max_entries = 1,
.map_flags = 0,
};
SEC("xdp_mimtest")
int xdp_mimtest0(struct xdp_md *ctx)
{
int value = 123;
int key = 0;
void *map;
map = bpf_map_lookup_elem(&mim_array, &key);
if (!map)
return XDP_DROP;
bpf_map_update_elem(map, &key, &value, 0);
map = bpf_map_lookup_elem(&mim_hash, &key);
if (!map)
return XDP_DROP;
bpf_map_update_elem(map, &key, &value, 0);
return XDP_PASS;
}
int _version SEC("version") = 1;
char _license[] SEC("license") = "GPL";

90
tools/testing/selftests/bpf/test_maps.c
View file

@ -1125,6 +1125,94 @@ static void test_sockmap(int tasks, void *data)
exit(1);
}
#define MAPINMAP_PROG "./test_map_in_map.o"
static void test_map_in_map(void)
{
struct bpf_program *prog;
struct bpf_object *obj;
struct bpf_map *map;
int mim_fd, fd, err;
int pos = 0;
obj = bpf_object__open(MAPINMAP_PROG);
fd = bpf_create_map(BPF_MAP_TYPE_HASH, sizeof(int), sizeof(int),
2, 0);
if (fd < 0) {
printf("Failed to create hashmap '%s'!\n", strerror(errno));
exit(1);
}
map = bpf_object__find_map_by_name(obj, "mim_array");
if (IS_ERR(map)) {
printf("Failed to load array of maps from test prog\n");
goto out_map_in_map;
}
err = bpf_map__set_inner_map_fd(map, fd);
if (err) {
printf("Failed to set inner_map_fd for array of maps\n");
goto out_map_in_map;
}
map = bpf_object__find_map_by_name(obj, "mim_hash");
if (IS_ERR(map)) {
printf("Failed to load hash of maps from test prog\n");
goto out_map_in_map;
}
err = bpf_map__set_inner_map_fd(map, fd);
if (err) {
printf("Failed to set inner_map_fd for hash of maps\n");
goto out_map_in_map;
}
bpf_object__for_each_program(prog, obj) {
bpf_program__set_xdp(prog);
}
bpf_object__load(obj);
map = bpf_object__find_map_by_name(obj, "mim_array");
if (IS_ERR(map)) {
printf("Failed to load array of maps from test prog\n");
goto out_map_in_map;
}
mim_fd = bpf_map__fd(map);
if (mim_fd < 0) {
printf("Failed to get descriptor for array of maps\n");
goto out_map_in_map;
}
err = bpf_map_update_elem(mim_fd, &pos, &fd, 0);
if (err) {
printf("Failed to update array of maps\n");
goto out_map_in_map;
}
map = bpf_object__find_map_by_name(obj, "mim_hash");
if (IS_ERR(map)) {
printf("Failed to load hash of maps from test prog\n");
goto out_map_in_map;
}
mim_fd = bpf_map__fd(map);
if (mim_fd < 0) {
printf("Failed to get descriptor for hash of maps\n");
goto out_map_in_map;
}
err = bpf_map_update_elem(mim_fd, &pos, &fd, 0);
if (err) {
printf("Failed to update hash of maps\n");
goto out_map_in_map;
}
close(fd);
bpf_object__close(obj);
return;
out_map_in_map:
close(fd);
exit(1);
}
#define MAP_SIZE (32 * 1024)
static void test_map_large(void)
@ -1600,6 +1688,8 @@ static void run_all_tests(void)
test_queuemap(0, NULL);
test_stackmap(0, NULL);
test_map_in_map();
}
int main(void)