selftests/bpf: Add raw_tp_test_run

// SPDX-License-Identifier: GPL-2.0-only

/* Copyright (c) 2019 Facebook */

#include <test_progs.h>

#include <linux/bpf.h>

#include "bpf/libbpf_internal.h"

#include "test_raw_tp_test_run.skel.h"

static int duration;

void test_raw_tp_test_run(void)

{

	struct bpf_prog_test_run_attr test_attr = {};

	int comm_fd = -1, err, nr_online, i, prog_fd;

	__u64 args[2] = {0x1234ULL, 0x5678ULL};

	int expected_retval = 0x1234 + 0x5678;

	struct test_raw_tp_test_run *skel;

	char buf[] = "new_name";

	bool *online = NULL;

	DECLARE_LIBBPF_OPTS(bpf_test_run_opts, opts,

			    .ctx_in = args,

			    .ctx_size_in = sizeof(args),

			    .flags = BPF_F_TEST_RUN_ON_CPU,

		);

	err = parse_cpu_mask_file("/sys/devices/system/cpu/online", &online,

				  &nr_online);

	if (CHECK(err, "parse_cpu_mask_file", "err %d\n", err))

		return;

	skel = test_raw_tp_test_run__open_and_load();

	if (CHECK(!skel, "skel_open", "failed to open skeleton\n"))

		goto cleanup;

	err = test_raw_tp_test_run__attach(skel);

	if (CHECK(err, "skel_attach", "skeleton attach failed: %d\n", err))

		goto cleanup;

	comm_fd = open("/proc/self/comm", O_WRONLY|O_TRUNC);

	if (CHECK(comm_fd < 0, "open /proc/self/comm", "err %d\n", errno))

		goto cleanup;

	err = write(comm_fd, buf, sizeof(buf));

	CHECK(err < 0, "task rename", "err %d", errno);

	CHECK(skel->bss->count == 0, "check_count", "didn't increase\n");

	CHECK(skel->data->on_cpu != 0xffffffff, "check_on_cpu", "got wrong value\n");

	prog_fd = bpf_program__fd(skel->progs.rename);

	test_attr.prog_fd = prog_fd;

	test_attr.ctx_in = args;

	test_attr.ctx_size_in = sizeof(__u64);

	err = bpf_prog_test_run_xattr(&test_attr);

	CHECK(err == 0, "test_run", "should fail for too small ctx\n");

	test_attr.ctx_size_in = sizeof(args);

	err = bpf_prog_test_run_xattr(&test_attr);

	CHECK(err < 0, "test_run", "err %d\n", errno);

	CHECK(test_attr.retval != expected_retval, "check_retval",

	      "expect 0x%x, got 0x%x\n", expected_retval, test_attr.retval);

	for (i = 0; i < nr_online; i++) {

		if (!online[i])

			continue;

		opts.cpu = i;

		opts.retval = 0;

		err = bpf_prog_test_run_opts(prog_fd, &opts);

		CHECK(err < 0, "test_run_opts", "err %d\n", errno);

		CHECK(skel->data->on_cpu != i, "check_on_cpu",

		      "expect %d got %d\n", i, skel->data->on_cpu);

		CHECK(opts.retval != expected_retval,

		      "check_retval", "expect 0x%x, got 0x%x\n",

		      expected_retval, opts.retval);

	}

	/* invalid cpu ID should fail with ENXIO */

	opts.cpu = 0xffffffff;

	err = bpf_prog_test_run_opts(prog_fd, &opts);

	CHECK(err != -1 || errno != ENXIO,

	      "test_run_opts_fail",

	      "should failed with ENXIO\n");

	/* non-zero cpu w/o BPF_F_TEST_RUN_ON_CPU should fail with EINVAL */

	opts.cpu = 1;

	opts.flags = 0;

	err = bpf_prog_test_run_opts(prog_fd, &opts);

	CHECK(err != -1 || errno != EINVAL,

	      "test_run_opts_fail",

	      "should failed with EINVAL\n");

cleanup:

	close(comm_fd);

	test_raw_tp_test_run__destroy(skel);

	free(online);

}

// SPDX-License-Identifier: GPL-2.0

/* Copyright (c) 2020 Facebook */

#include "vmlinux.h"

#include <bpf/bpf_helpers.h>

#include <bpf/bpf_tracing.h>

__u32 count = 0;

__u32 on_cpu = 0xffffffff;

SEC("raw_tp/task_rename")

int BPF_PROG(rename, struct task_struct *task, char *comm)

{

	count++;

	if ((__u64) task == 0x1234ULL && (__u64) comm == 0x5678ULL) {

		on_cpu = bpf_get_smp_processor_id();

		return (int)task + (int)comm;

	}

	return 0;

}

char _license[] SEC("license") = "GPL";