#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/epoll.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <util/util.h>
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#include <util/bpf-loader.h>
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#include <util/evlist.h>
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#include <linux/bpf.h>
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#include <linux/filter.h>
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#include <linux/kernel.h>
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#include <api/fs/fs.h>
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#include <bpf/bpf.h>
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#include "tests.h"
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#include "llvm.h"
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#include "debug.h"
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#define NR_ITERS 111
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#define PERF_TEST_BPF_PATH "/sys/fs/bpf/perf_test"
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#ifdef HAVE_LIBBPF_SUPPORT
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static int epoll_pwait_loop(void)
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{
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int i;
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/* Should fail NR_ITERS times */
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for (i = 0; i < NR_ITERS; i++)
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epoll_pwait(-(i + 1), NULL, 0, 0, NULL);
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return 0;
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}
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#ifdef HAVE_BPF_PROLOGUE
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static int llseek_loop(void)
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{
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int fds[2], i;
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fds[0] = open("/dev/null", O_RDONLY);
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fds[1] = open("/dev/null", O_RDWR);
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if (fds[0] < 0 || fds[1] < 0)
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return -1;
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for (i = 0; i < NR_ITERS; i++) {
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lseek(fds[i % 2], i, (i / 2) % 2 ? SEEK_CUR : SEEK_SET);
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lseek(fds[(i + 1) % 2], i, (i / 2) % 2 ? SEEK_CUR : SEEK_SET);
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}
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close(fds[0]);
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close(fds[1]);
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return 0;
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}
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#endif
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static struct {
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enum test_llvm__testcase prog_id;
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const char *desc;
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const char *name;
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const char *msg_compile_fail;
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const char *msg_load_fail;
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int (*target_func)(void);
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int expect_result;
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bool pin;
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} bpf_testcase_table[] = {
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{
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.prog_id = LLVM_TESTCASE_BASE,
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.desc = "Basic BPF filtering",
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.name = "[basic_bpf_test]",
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.msg_compile_fail = "fix 'perf test LLVM' first",
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.msg_load_fail = "load bpf object failed",
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.target_func = &epoll_pwait_loop,
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.expect_result = (NR_ITERS + 1) / 2,
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},
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{
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.prog_id = LLVM_TESTCASE_BASE,
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.desc = "BPF pinning",
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.name = "[bpf_pinning]",
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.msg_compile_fail = "fix kbuild first",
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.msg_load_fail = "check your vmlinux setting?",
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.target_func = &epoll_pwait_loop,
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.expect_result = (NR_ITERS + 1) / 2,
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.pin = true,
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},
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#ifdef HAVE_BPF_PROLOGUE
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{
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.prog_id = LLVM_TESTCASE_BPF_PROLOGUE,
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.desc = "BPF prologue generation",
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.name = "[bpf_prologue_test]",
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.msg_compile_fail = "fix kbuild first",
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.msg_load_fail = "check your vmlinux setting?",
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.target_func = &llseek_loop,
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.expect_result = (NR_ITERS + 1) / 4,
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},
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#endif
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{
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.prog_id = LLVM_TESTCASE_BPF_RELOCATION,
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.desc = "BPF relocation checker",
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.name = "[bpf_relocation_test]",
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.msg_compile_fail = "fix 'perf test LLVM' first",
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.msg_load_fail = "libbpf error when dealing with relocation",
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},
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};
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static int do_test(struct bpf_object *obj, int (*func)(void),
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int expect)
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{
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struct record_opts opts = {
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.target = {
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.uid = UINT_MAX,
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.uses_mmap = true,
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},
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.freq = 0,
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.mmap_pages = 256,
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.default_interval = 1,
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};
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char pid[16];
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char sbuf[STRERR_BUFSIZE];
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struct perf_evlist *evlist;
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int i, ret = TEST_FAIL, err = 0, count = 0;
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struct parse_events_state parse_state;
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struct parse_events_error parse_error;
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bzero(&parse_error, sizeof(parse_error));
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bzero(&parse_state, sizeof(parse_state));
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parse_state.error = &parse_error;
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INIT_LIST_HEAD(&parse_state.list);
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err = parse_events_load_bpf_obj(&parse_state, &parse_state.list, obj, NULL);
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if (err || list_empty(&parse_state.list)) {
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pr_debug("Failed to add events selected by BPF\n");
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return TEST_FAIL;
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}
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snprintf(pid, sizeof(pid), "%d", getpid());
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pid[sizeof(pid) - 1] = '\0';
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opts.target.tid = opts.target.pid = pid;
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/* Instead of perf_evlist__new_default, don't add default events */
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evlist = perf_evlist__new();
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if (!evlist) {
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pr_debug("Not enough memory to create evlist\n");
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return TEST_FAIL;
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}
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err = perf_evlist__create_maps(evlist, &opts.target);
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if (err < 0) {
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pr_debug("Not enough memory to create thread/cpu maps\n");
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goto out_delete_evlist;
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}
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perf_evlist__splice_list_tail(evlist, &parse_state.list);
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evlist->nr_groups = parse_state.nr_groups;
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perf_evlist__config(evlist, &opts, NULL);
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err = perf_evlist__open(evlist);
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if (err < 0) {
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pr_debug("perf_evlist__open: %s\n",
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str_error_r(errno, sbuf, sizeof(sbuf)));
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goto out_delete_evlist;
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}
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err = perf_evlist__mmap(evlist, opts.mmap_pages);
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if (err < 0) {
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pr_debug("perf_evlist__mmap: %s\n",
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str_error_r(errno, sbuf, sizeof(sbuf)));
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goto out_delete_evlist;
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}
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perf_evlist__enable(evlist);
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(*func)();
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perf_evlist__disable(evlist);
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for (i = 0; i < evlist->nr_mmaps; i++) {
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union perf_event *event;
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struct perf_mmap *md;
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md = &evlist->mmap[i];
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if (perf_mmap__read_init(md) < 0)
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continue;
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while ((event = perf_mmap__read_event(md)) != NULL) {
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const u32 type = event->header.type;
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if (type == PERF_RECORD_SAMPLE)
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count ++;
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}
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perf_mmap__read_done(md);
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}
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if (count != expect) {
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pr_debug("BPF filter result incorrect, expected %d, got %d samples\n", expect, count);
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goto out_delete_evlist;
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}
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ret = TEST_OK;
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out_delete_evlist:
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perf_evlist__delete(evlist);
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return ret;
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}
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static struct bpf_object *
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prepare_bpf(void *obj_buf, size_t obj_buf_sz, const char *name)
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{
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struct bpf_object *obj;
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obj = bpf__prepare_load_buffer(obj_buf, obj_buf_sz, name);
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if (IS_ERR(obj)) {
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pr_debug("Compile BPF program failed.\n");
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return NULL;
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}
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return obj;
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}
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static int __test__bpf(int idx)
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{
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int ret;
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void *obj_buf;
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size_t obj_buf_sz;
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struct bpf_object *obj;
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ret = test_llvm__fetch_bpf_obj(&obj_buf, &obj_buf_sz,
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bpf_testcase_table[idx].prog_id,
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true, NULL);
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if (ret != TEST_OK || !obj_buf || !obj_buf_sz) {
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pr_debug("Unable to get BPF object, %s\n",
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bpf_testcase_table[idx].msg_compile_fail);
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if (idx == 0)
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return TEST_SKIP;
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else
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return TEST_FAIL;
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}
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obj = prepare_bpf(obj_buf, obj_buf_sz,
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bpf_testcase_table[idx].name);
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if ((!!bpf_testcase_table[idx].target_func) != (!!obj)) {
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if (!obj)
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pr_debug("Fail to load BPF object: %s\n",
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bpf_testcase_table[idx].msg_load_fail);
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else
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pr_debug("Success unexpectedly: %s\n",
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bpf_testcase_table[idx].msg_load_fail);
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ret = TEST_FAIL;
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goto out;
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}
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if (obj) {
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ret = do_test(obj,
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bpf_testcase_table[idx].target_func,
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bpf_testcase_table[idx].expect_result);
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if (ret != TEST_OK)
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goto out;
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if (bpf_testcase_table[idx].pin) {
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int err;
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if (!bpf_fs__mount()) {
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pr_debug("BPF filesystem not mounted\n");
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ret = TEST_FAIL;
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goto out;
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}
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err = mkdir(PERF_TEST_BPF_PATH, 0777);
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if (err && errno != EEXIST) {
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pr_debug("Failed to make perf_test dir: %s\n",
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strerror(errno));
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ret = TEST_FAIL;
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goto out;
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}
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if (bpf_object__pin(obj, PERF_TEST_BPF_PATH))
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ret = TEST_FAIL;
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if (rm_rf(PERF_TEST_BPF_PATH))
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ret = TEST_FAIL;
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}
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}
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out:
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free(obj_buf);
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bpf__clear();
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return ret;
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}
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int test__bpf_subtest_get_nr(void)
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{
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return (int)ARRAY_SIZE(bpf_testcase_table);
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}
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const char *test__bpf_subtest_get_desc(int i)
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{
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if (i < 0 || i >= (int)ARRAY_SIZE(bpf_testcase_table))
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return NULL;
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return bpf_testcase_table[i].desc;
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}
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static int check_env(void)
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{
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int err;
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unsigned int kver_int;
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char license[] = "GPL";
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struct bpf_insn insns[] = {
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BPF_MOV64_IMM(BPF_REG_0, 1),
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BPF_EXIT_INSN(),
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};
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err = fetch_kernel_version(&kver_int, NULL, 0);
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if (err) {
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pr_debug("Unable to get kernel version\n");
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return err;
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}
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err = bpf_load_program(BPF_PROG_TYPE_KPROBE, insns,
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sizeof(insns) / sizeof(insns[0]),
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license, kver_int, NULL, 0);
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if (err < 0) {
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pr_err("Missing basic BPF support, skip this test: %s\n",
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strerror(errno));
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return err;
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}
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close(err);
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return 0;
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}
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int test__bpf(struct test *test __maybe_unused, int i)
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{
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int err;
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if (i < 0 || i >= (int)ARRAY_SIZE(bpf_testcase_table))
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return TEST_FAIL;
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if (geteuid() != 0) {
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pr_debug("Only root can run BPF test\n");
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return TEST_SKIP;
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}
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if (check_env())
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return TEST_SKIP;
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err = __test__bpf(i);
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return err;
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}
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#else
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int test__bpf_subtest_get_nr(void)
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{
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return 0;
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}
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const char *test__bpf_subtest_get_desc(int i __maybe_unused)
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{
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return NULL;
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}
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int test__bpf(struct test *test __maybe_unused, int i __maybe_unused)
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{
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pr_debug("Skip BPF test because BPF support is not compiled\n");
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return TEST_SKIP;
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}
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#endif
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