bpf/prog_tests/raw_tp_writable_test_run.c

0001 // SPDX-License-Identifier: GPL-2.0
0002
0003 #include <test_progs.h>
0004 #include <linux/nbd.h>
0005
0006 /* NOTE: conflict with other tests. */
0007 void serial_test_raw_tp_writable_test_run(void)
0008 {
0009     __u32 duration = 0;
0010     char error[4096];
0011
0012     const struct bpf_insn trace_program[] = {
0013         BPF_LDX_MEM(BPF_DW, BPF_REG_6, BPF_REG_1, 0),
0014         BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_6, 0),
0015         BPF_MOV64_IMM(BPF_REG_0, 42),
0016         BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_0, 0),
0017         BPF_EXIT_INSN(),
0018     };
0019
0020     LIBBPF_OPTS(bpf_prog_load_opts, trace_opts,
0021         .log_level = 2,
0022         .log_buf = error,
0023         .log_size = sizeof(error),
0024     );
0025
0026     int bpf_fd = bpf_prog_load(BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE, NULL, "GPL v2",
0027                    trace_program, sizeof(trace_program) / sizeof(struct bpf_insn),
0028                    &trace_opts);
0029     if (CHECK(bpf_fd < 0, "bpf_raw_tracepoint_writable loaded",
0030           "failed: %d errno %d\n", bpf_fd, errno))
0031         return;
0032
0033     const struct bpf_insn skb_program[] = {
0034         BPF_MOV64_IMM(BPF_REG_0, 0),
0035         BPF_EXIT_INSN(),
0036     };
0037
0038     LIBBPF_OPTS(bpf_prog_load_opts, skb_opts,
0039         .log_buf = error,
0040         .log_size = sizeof(error),
0041     );
0042
0043     int filter_fd = bpf_prog_load(BPF_PROG_TYPE_SOCKET_FILTER, NULL, "GPL v2",
0044                       skb_program, sizeof(skb_program) / sizeof(struct bpf_insn),
0045                       &skb_opts);
0046     if (CHECK(filter_fd < 0, "test_program_loaded", "failed: %d errno %d\n",
0047           filter_fd, errno))
0048         goto out_bpffd;
0049
0050     int tp_fd = bpf_raw_tracepoint_open("bpf_test_finish", bpf_fd);
0051     if (CHECK(tp_fd < 0, "bpf_raw_tracepoint_writable opened",
0052           "failed: %d errno %d\n", tp_fd, errno))
0053         goto out_filterfd;
0054
0055     char test_skb[128] = {
0056         0,
0057     };
0058
0059     LIBBPF_OPTS(bpf_test_run_opts, topts,
0060         .data_in = test_skb,
0061         .data_size_in = sizeof(test_skb),
0062         .repeat = 1,
0063     );
0064     int err = bpf_prog_test_run_opts(filter_fd, &topts);
0065     CHECK(err != 42, "test_run",
0066           "tracepoint did not modify return value\n");
0067     CHECK(topts.retval != 0, "test_run_ret",
0068           "socket_filter did not return 0\n");
0069
0070     close(tp_fd);
0071
0072     err = bpf_prog_test_run_opts(filter_fd, &topts);
0073     CHECK(err != 0, "test_run_notrace",
0074           "test_run failed with %d errno %d\n", err, errno);
0075     CHECK(topts.retval != 0, "test_run_ret_notrace",
0076           "socket_filter did not return 0\n");
0077
0078 out_filterfd:
0079     close(filter_fd);
0080 out_bpffd:
0081     close(bpf_fd);
0082 }