From e76d776e9ca1fe266b3a7f8091eee5d1e635a545 Mon Sep 17 00:00:00 2001 From: Alexei Starovoitov Date: Thu, 14 Nov 2019 10:57:12 -0800 Subject: [PATCH] selftests/bpf: Add stress test for maximum number of progs Add stress test for maximum number of attached BPF programs per BPF trampoline. Signed-off-by: Alexei Starovoitov Signed-off-by: Daniel Borkmann Acked-by: Song Liu Link: https://lore.kernel.org/bpf/20191114185720.1641606-13-ast@kernel.org --- .../selftests/bpf/prog_tests/fexit_stress.c | 76 +++++++++++++++++++ 1 file changed, 76 insertions(+) create mode 100644 tools/testing/selftests/bpf/prog_tests/fexit_stress.c diff --git a/tools/testing/selftests/bpf/prog_tests/fexit_stress.c b/tools/testing/selftests/bpf/prog_tests/fexit_stress.c new file mode 100644 index 000000000000..3b9dbf7433f0 --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/fexit_stress.c @@ -0,0 +1,76 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2019 Facebook */ +#include + +/* x86-64 fits 55 JITed and 43 interpreted progs into half page */ +#define CNT 40 + +void test_fexit_stress(void) +{ + char test_skb[128] = {}; + int fexit_fd[CNT] = {}; + int link_fd[CNT] = {}; + __u32 duration = 0; + char error[4096]; + __u32 prog_ret; + int err, i, filter_fd; + + const struct bpf_insn trace_program[] = { + BPF_MOV64_IMM(BPF_REG_0, 0), + BPF_EXIT_INSN(), + }; + + struct bpf_load_program_attr load_attr = { + .prog_type = BPF_PROG_TYPE_TRACING, + .license = "GPL", + .insns = trace_program, + .insns_cnt = sizeof(trace_program) / sizeof(struct bpf_insn), + .expected_attach_type = BPF_TRACE_FEXIT, + }; + + const struct bpf_insn skb_program[] = { + BPF_MOV64_IMM(BPF_REG_0, 0), + BPF_EXIT_INSN(), + }; + + struct bpf_load_program_attr skb_load_attr = { + .prog_type = BPF_PROG_TYPE_SOCKET_FILTER, + .license = "GPL", + .insns = skb_program, + .insns_cnt = sizeof(skb_program) / sizeof(struct bpf_insn), + }; + + err = libbpf_find_vmlinux_btf_id("bpf_fentry_test1", + load_attr.expected_attach_type); + if (CHECK(err <= 0, "find_vmlinux_btf_id", "failed: %d\n", err)) + goto out; + load_attr.attach_btf_id = err; + + for (i = 0; i < CNT; i++) { + fexit_fd[i] = bpf_load_program_xattr(&load_attr, error, sizeof(error)); + if (CHECK(fexit_fd[i] < 0, "fexit loaded", + "failed: %d errno %d\n", fexit_fd[i], errno)) + goto out; + link_fd[i] = bpf_raw_tracepoint_open(NULL, fexit_fd[i]); + if (CHECK(link_fd[i] < 0, "fexit attach failed", + "prog %d failed: %d err %d\n", i, link_fd[i], errno)) + goto out; + } + + filter_fd = bpf_load_program_xattr(&skb_load_attr, error, sizeof(error)); + if (CHECK(filter_fd < 0, "test_program_loaded", "failed: %d errno %d\n", + filter_fd, errno)) + goto out; + + err = bpf_prog_test_run(filter_fd, 1, test_skb, sizeof(test_skb), 0, + 0, &prog_ret, 0); + close(filter_fd); + CHECK_FAIL(err); +out: + for (i = 0; i < CNT; i++) { + if (link_fd[i]) + close(link_fd[i]); + if (fexit_fd[i]) + close(fexit_fd[i]); + } +} -- 2.30.2