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perf test: Add libbpf pinning test

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Add a test for the newly added BPF object pinning functionality.

For example:

  # tools/perf/perf test 37
    37: BPF filter                                 :
    37.1: Basic BPF filtering                      : Ok
    37.2: BPF pinning                              : Ok
    37.3: BPF prologue generation                  : Ok
    37.4: BPF relocation checker                   : Ok

  # tools/perf/perf test 37 -v 2>&1 | grep pinned
    libbpf: pinned map '/sys/fs/bpf/perf_test/flip_table'
    libbpf: pinned program '/sys/fs/bpf/perf_test/func=SyS_epoll_wait/0'

Signed-off-by: Joe Stringer <joe@ovn.org>
Requested-and-Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexei Starovoitov <ast@fb.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Wang Nan <wangnan0@huawei.com>
Cc: netdev@vger.kernel.org
Link: http://lkml.kernel.org/r/20170126212001.14103-7-joe@ovn.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Joe Stringer 2017-01-26 13:20:01 -08:00 committed by Arnaldo Carvalho de Melo
parent 71dc4c3068
commit a26305363d
1 changed files with 41 additions and 1 deletions
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42
tools/perf/tests/bpf.c
View File

@ -5,11 +5,13 @@
#include <util/evlist.h>
#include <linux/bpf.h>
#include <linux/filter.h>
#include <api/fs/fs.h>
#include <bpf/bpf.h>
#include "tests.h"
#include "llvm.h"
#include "debug.h"
#define NR_ITERS 111
#define PERF_TEST_BPF_PATH "/sys/fs/bpf/perf_test"
#ifdef HAVE_LIBBPF_SUPPORT
@ -54,6 +56,7 @@ static struct {
const char *msg_load_fail;
int (*target_func)(void);
int expect_result;
bool pin;
} bpf_testcase_table[] = {
{
LLVM_TESTCASE_BASE,
@ -63,6 +66,17 @@ static struct {
"load bpf object failed",
&epoll_wait_loop,
(NR_ITERS + 1) / 2,
false,
},
{
LLVM_TESTCASE_BASE,
"BPF pinning",
"[bpf_pinning]",
"fix kbuild first",
"check your vmlinux setting?",
&epoll_wait_loop,
(NR_ITERS + 1) / 2,
true,
},
#ifdef HAVE_BPF_PROLOGUE
{
@ -73,6 +87,7 @@ static struct {
"check your vmlinux setting?",
&llseek_loop,
(NR_ITERS + 1) / 4,
false,
},
#endif
{
@ -83,6 +98,7 @@ static struct {
"libbpf error when dealing with relocation",
NULL,
0,
false,
},
};
@ -226,10 +242,34 @@ static int __test__bpf(int idx)
goto out;
}
if (obj)
if (obj) {
ret = do_test(obj,
bpf_testcase_table[idx].target_func,
bpf_testcase_table[idx].expect_result);
if (ret != TEST_OK)
goto out;
if (bpf_testcase_table[idx].pin) {
int err;
if (!bpf_fs__mount()) {
pr_debug("BPF filesystem not mounted\n");
ret = TEST_FAIL;
goto out;
}
err = mkdir(PERF_TEST_BPF_PATH, 0777);
if (err && errno != EEXIST) {
pr_debug("Failed to make perf_test dir: %s\n",
strerror(errno));
ret = TEST_FAIL;
goto out;
}
if (bpf_object__pin(obj, PERF_TEST_BPF_PATH))
ret = TEST_FAIL;
if (rm_rf(PERF_TEST_BPF_PATH))
ret = TEST_FAIL;
}
}
out:
bpf__clear();
return ret;