1 // SPDX-License-Identifier: GPL-2.0 2 #include "test_progs.h" 3 #include "network_helpers.h" 4 5 static __u32 duration; 6 7 static void test_global_func_args0(struct bpf_object *obj) 8 { 9 int err, i, map_fd, actual_value; 10 const char *map_name = "values"; 11 12 map_fd = bpf_find_map(__func__, obj, map_name); 13 if (CHECK(map_fd < 0, "bpf_find_map", "cannot find BPF map %s: %s\n", 14 map_name, strerror(errno))) 15 return; 16 17 struct { 18 const char *descr; 19 int expected_value; 20 } tests[] = { 21 {"passing NULL pointer", 0}, 22 {"returning value", 1}, 23 {"reading local variable", 100 }, 24 {"writing local variable", 101 }, 25 {"reading global variable", 42 }, 26 {"writing global variable", 43 }, 27 {"writing to pointer-to-pointer", 1 }, 28 }; 29 30 for (i = 0; i < ARRAY_SIZE(tests); ++i) { 31 const int expected_value = tests[i].expected_value; 32 33 err = bpf_map_lookup_elem(map_fd, &i, &actual_value); 34 35 CHECK(err || actual_value != expected_value, tests[i].descr, 36 "err %d result %d expected %d\n", err, actual_value, expected_value); 37 } 38 } 39 40 void test_global_func_args(void) 41 { 42 const char *file = "./test_global_func_args.o"; 43 __u32 retval; 44 struct bpf_object *obj; 45 int err, prog_fd; 46 47 err = bpf_prog_test_load(file, BPF_PROG_TYPE_CGROUP_SKB, &obj, &prog_fd); 48 if (CHECK(err, "load program", "error %d loading %s\n", err, file)) 49 return; 50 51 err = bpf_prog_test_run(prog_fd, 1, &pkt_v4, sizeof(pkt_v4), 52 NULL, NULL, &retval, &duration); 53 CHECK(err || retval, "pass global func args run", 54 "err %d errno %d retval %d duration %d\n", 55 err, errno, retval, duration); 56 57 test_global_func_args0(obj); 58 59 bpf_object__close(obj); 60 } 61