1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/compiler.h>
3 #include <linux/kernel.h>
4 #include "tests.h"
5 #include "map.h"
6 #include "maps.h"
7 #include "dso.h"
8 #include "debug.h"
9 
10 struct map_def {
11 	const char *name;
12 	u64 start;
13 	u64 end;
14 };
15 
check_maps(struct map_def * merged,unsigned int size,struct maps * maps)16 static int check_maps(struct map_def *merged, unsigned int size, struct maps *maps)
17 {
18 	struct map *map;
19 	unsigned int i = 0;
20 
21 	maps__for_each_entry(maps, map) {
22 		if (i > 0)
23 			TEST_ASSERT_VAL("less maps expected", (map && i < size) || (!map && i == size));
24 
25 		TEST_ASSERT_VAL("wrong map start",  map->start == merged[i].start);
26 		TEST_ASSERT_VAL("wrong map end",    map->end == merged[i].end);
27 		TEST_ASSERT_VAL("wrong map name",  !strcmp(map->dso->name, merged[i].name));
28 		TEST_ASSERT_VAL("wrong map refcnt", refcount_read(&map->refcnt) == 1);
29 
30 		i++;
31 	}
32 
33 	return TEST_OK;
34 }
35 
test__maps__merge_in(struct test_suite * t __maybe_unused,int subtest __maybe_unused)36 static int test__maps__merge_in(struct test_suite *t __maybe_unused, int subtest __maybe_unused)
37 {
38 	unsigned int i;
39 	struct map_def bpf_progs[] = {
40 		{ "bpf_prog_1", 200, 300 },
41 		{ "bpf_prog_2", 500, 600 },
42 		{ "bpf_prog_3", 800, 900 },
43 	};
44 	struct map_def merged12[] = {
45 		{ "kcore1",     100,  200 },
46 		{ "bpf_prog_1", 200,  300 },
47 		{ "kcore1",     300,  500 },
48 		{ "bpf_prog_2", 500,  600 },
49 		{ "kcore1",     600,  800 },
50 		{ "bpf_prog_3", 800,  900 },
51 		{ "kcore1",     900, 1000 },
52 	};
53 	struct map_def merged3[] = {
54 		{ "kcore1",      100,  200 },
55 		{ "bpf_prog_1",  200,  300 },
56 		{ "kcore1",      300,  500 },
57 		{ "bpf_prog_2",  500,  600 },
58 		{ "kcore1",      600,  800 },
59 		{ "bpf_prog_3",  800,  900 },
60 		{ "kcore1",      900, 1000 },
61 		{ "kcore3",     1000, 1100 },
62 	};
63 	struct map *map_kcore1, *map_kcore2, *map_kcore3;
64 	int ret;
65 	struct maps *maps = maps__new(NULL);
66 
67 	TEST_ASSERT_VAL("failed to create maps", maps);
68 
69 	for (i = 0; i < ARRAY_SIZE(bpf_progs); i++) {
70 		struct map *map;
71 
72 		map = dso__new_map(bpf_progs[i].name);
73 		TEST_ASSERT_VAL("failed to create map", map);
74 
75 		map->start = bpf_progs[i].start;
76 		map->end   = bpf_progs[i].end;
77 		maps__insert(maps, map);
78 		map__put(map);
79 	}
80 
81 	map_kcore1 = dso__new_map("kcore1");
82 	TEST_ASSERT_VAL("failed to create map", map_kcore1);
83 
84 	map_kcore2 = dso__new_map("kcore2");
85 	TEST_ASSERT_VAL("failed to create map", map_kcore2);
86 
87 	map_kcore3 = dso__new_map("kcore3");
88 	TEST_ASSERT_VAL("failed to create map", map_kcore3);
89 
90 	/* kcore1 map overlaps over all bpf maps */
91 	map_kcore1->start = 100;
92 	map_kcore1->end   = 1000;
93 
94 	/* kcore2 map hides behind bpf_prog_2 */
95 	map_kcore2->start = 550;
96 	map_kcore2->end   = 570;
97 
98 	/* kcore3 map hides behind bpf_prog_3, kcore1 and adds new map */
99 	map_kcore3->start = 880;
100 	map_kcore3->end   = 1100;
101 
102 	ret = maps__merge_in(maps, map_kcore1);
103 	TEST_ASSERT_VAL("failed to merge map", !ret);
104 
105 	ret = check_maps(merged12, ARRAY_SIZE(merged12), maps);
106 	TEST_ASSERT_VAL("merge check failed", !ret);
107 
108 	ret = maps__merge_in(maps, map_kcore2);
109 	TEST_ASSERT_VAL("failed to merge map", !ret);
110 
111 	ret = check_maps(merged12, ARRAY_SIZE(merged12), maps);
112 	TEST_ASSERT_VAL("merge check failed", !ret);
113 
114 	ret = maps__merge_in(maps, map_kcore3);
115 	TEST_ASSERT_VAL("failed to merge map", !ret);
116 
117 	ret = check_maps(merged3, ARRAY_SIZE(merged3), maps);
118 	TEST_ASSERT_VAL("merge check failed", !ret);
119 
120 	maps__delete(maps);
121 	return TEST_OK;
122 }
123 
124 DEFINE_SUITE("maps__merge_in", maps__merge_in);
125