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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 | // SPDX-License-Identifier: GPL-2.0 /* Copyright (C) 2023. Huawei Technologies Co., Ltd */ #define _GNU_SOURCE #include <unistd.h> #include <sys/syscall.h> #include <test_progs.h> #include <bpf/btf.h> #include "access_map_in_map.skel.h" struct thread_ctx { pthread_barrier_t barrier; int outer_map_fd; int start, abort; int loop, err; }; static int wait_for_start_or_abort(struct thread_ctx *ctx) { while (!ctx->start && !ctx->abort) usleep(1); return ctx->abort ? -1 : 0; } static void *update_map_fn(void *data) { struct thread_ctx *ctx = data; int loop = ctx->loop, err = 0; if (wait_for_start_or_abort(ctx) < 0) return NULL; pthread_barrier_wait(&ctx->barrier); while (loop-- > 0) { int fd, zero = 0; fd = bpf_map_create(BPF_MAP_TYPE_ARRAY, NULL, 4, 4, 1, NULL); if (fd < 0) { err |= 1; pthread_barrier_wait(&ctx->barrier); continue; } /* Remove the old inner map */ if (bpf_map_update_elem(ctx->outer_map_fd, &zero, &fd, 0) < 0) err |= 2; close(fd); pthread_barrier_wait(&ctx->barrier); } ctx->err = err; return NULL; } static void *access_map_fn(void *data) { struct thread_ctx *ctx = data; int loop = ctx->loop; if (wait_for_start_or_abort(ctx) < 0) return NULL; pthread_barrier_wait(&ctx->barrier); while (loop-- > 0) { /* Access the old inner map */ syscall(SYS_getpgid); pthread_barrier_wait(&ctx->barrier); } return NULL; } static void test_map_in_map_access(const char *prog_name, const char *map_name) { struct access_map_in_map *skel; struct bpf_map *outer_map; struct bpf_program *prog; struct thread_ctx ctx; pthread_t tid[2]; int err; skel = access_map_in_map__open(); if (!ASSERT_OK_PTR(skel, "access_map_in_map open")) return; prog = bpf_object__find_program_by_name(skel->obj, prog_name); if (!ASSERT_OK_PTR(prog, "find program")) goto out; bpf_program__set_autoload(prog, true); outer_map = bpf_object__find_map_by_name(skel->obj, map_name); if (!ASSERT_OK_PTR(outer_map, "find map")) goto out; err = access_map_in_map__load(skel); if (!ASSERT_OK(err, "access_map_in_map load")) goto out; err = access_map_in_map__attach(skel); if (!ASSERT_OK(err, "access_map_in_map attach")) goto out; skel->bss->tgid = getpid(); memset(&ctx, 0, sizeof(ctx)); pthread_barrier_init(&ctx.barrier, NULL, 2); ctx.outer_map_fd = bpf_map__fd(outer_map); ctx.loop = 4; err = pthread_create(&tid[0], NULL, update_map_fn, &ctx); if (!ASSERT_OK(err, "close_thread")) goto out; err = pthread_create(&tid[1], NULL, access_map_fn, &ctx); if (!ASSERT_OK(err, "read_thread")) { ctx.abort = 1; pthread_join(tid[0], NULL); goto out; } ctx.start = 1; pthread_join(tid[0], NULL); pthread_join(tid[1], NULL); ASSERT_OK(ctx.err, "err"); out: access_map_in_map__destroy(skel); } void test_map_in_map(void) { if (test__start_subtest("acc_map_in_array")) test_map_in_map_access("access_map_in_array", "outer_array_map"); if (test__start_subtest("sleepable_acc_map_in_array")) test_map_in_map_access("sleepable_access_map_in_array", "outer_array_map"); if (test__start_subtest("acc_map_in_htab")) test_map_in_map_access("access_map_in_htab", "outer_htab_map"); if (test__start_subtest("sleepable_acc_map_in_htab")) test_map_in_map_access("sleepable_access_map_in_htab", "outer_htab_map"); } |