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Commit a2630536 authored by Joe Stringer's avatar Joe Stringer Committed by Arnaldo Carvalho de Melo
Browse files

perf test: Add libbpf pinning test 



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: default avatarJoe Stringer <joe@ovn.org>
Requested-and-Tested-by: default avatarArnaldo 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: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 71dc4c30

tools/perf/tests/bpf.c

+41 −1
Original line number Diff line number Diff line
@@ -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;