mirror of
https://github.com/torvalds/linux.git
synced 2024-12-11 21:52:04 +00:00
9bc898c701
Previous patches introduce llvm__compile_bpf() to compile source file to eBPF object. This patch adds testcase to test it. It also tests libbpf by opening generated object after applying next patch which introduces HAVE_LIBBPF_SUPPORT option. Since llvm__compile_bpf() prints long messages which users who don't explicitly test llvm doesn't care, this patch set verbose to -1 to suppress all debug, warning and error message, and hint user use 'perf test -v' to see the full output. For the same reason, if clang is not found in PATH and there's no [llvm] section in .perfconfig, skip this test. Signed-off-by: Wang Nan <wangnan0@huawei.com> Acked-by: Alexei Starovoitov <ast@plumgrid.com> Cc: Brendan Gregg <brendan.d.gregg@gmail.com> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: David Ahern <dsahern@gmail.com> Cc: He Kuang <hekuang@huawei.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Kaixu Xia <xiakaixu@huawei.com> Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Zefan Li <lizefan@huawei.com> Cc: pi3orama@163.com Link: http://lkml.kernel.org/n/1436445342-1402-17-git-send-email-wangnan0@huawei.com [ Add tools/lib/bpf/ to tools/perf/MANIFEST, so that the tarball targets build ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
99 lines
2.3 KiB
C
99 lines
2.3 KiB
C
#include <stdio.h>
|
|
#include <bpf/libbpf.h>
|
|
#include <util/llvm-utils.h>
|
|
#include <util/cache.h>
|
|
#include "tests.h"
|
|
#include "debug.h"
|
|
|
|
static int perf_config_cb(const char *var, const char *val,
|
|
void *arg __maybe_unused)
|
|
{
|
|
return perf_default_config(var, val, arg);
|
|
}
|
|
|
|
/*
|
|
* Randomly give it a "version" section since we don't really load it
|
|
* into kernel
|
|
*/
|
|
static const char test_bpf_prog[] =
|
|
"__attribute__((section(\"do_fork\"), used)) "
|
|
"int fork(void *ctx) {return 0;} "
|
|
"char _license[] __attribute__((section(\"license\"), used)) = \"GPL\";"
|
|
"int _version __attribute__((section(\"version\"), used)) = 0x40100;";
|
|
|
|
#ifdef HAVE_LIBBPF_SUPPORT
|
|
static int test__bpf_parsing(void *obj_buf, size_t obj_buf_sz)
|
|
{
|
|
struct bpf_object *obj;
|
|
|
|
obj = bpf_object__open_buffer(obj_buf, obj_buf_sz);
|
|
if (!obj)
|
|
return -1;
|
|
bpf_object__close(obj);
|
|
return 0;
|
|
}
|
|
#else
|
|
static int test__bpf_parsing(void *obj_buf __maybe_unused,
|
|
size_t obj_buf_sz __maybe_unused)
|
|
{
|
|
fprintf(stderr, " (skip bpf parsing)");
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
int test__llvm(void)
|
|
{
|
|
char *tmpl_new, *clang_opt_new;
|
|
void *obj_buf;
|
|
size_t obj_buf_sz;
|
|
int err, old_verbose;
|
|
|
|
perf_config(perf_config_cb, NULL);
|
|
|
|
/*
|
|
* Skip this test if user's .perfconfig doesn't set [llvm] section
|
|
* and clang is not found in $PATH, and this is not perf test -v
|
|
*/
|
|
if (verbose == 0 && !llvm_param.user_set_param && llvm__search_clang()) {
|
|
fprintf(stderr, " (no clang, try 'perf test -v LLVM')");
|
|
return TEST_SKIP;
|
|
}
|
|
|
|
old_verbose = verbose;
|
|
/*
|
|
* llvm is verbosity when error. Suppress all error output if
|
|
* not 'perf test -v'.
|
|
*/
|
|
if (verbose == 0)
|
|
verbose = -1;
|
|
|
|
if (!llvm_param.clang_bpf_cmd_template)
|
|
return -1;
|
|
|
|
if (!llvm_param.clang_opt)
|
|
llvm_param.clang_opt = strdup("");
|
|
|
|
err = asprintf(&tmpl_new, "echo '%s' | %s", test_bpf_prog,
|
|
llvm_param.clang_bpf_cmd_template);
|
|
if (err < 0)
|
|
return -1;
|
|
err = asprintf(&clang_opt_new, "-xc %s", llvm_param.clang_opt);
|
|
if (err < 0)
|
|
return -1;
|
|
|
|
llvm_param.clang_bpf_cmd_template = tmpl_new;
|
|
llvm_param.clang_opt = clang_opt_new;
|
|
err = llvm__compile_bpf("-", &obj_buf, &obj_buf_sz);
|
|
|
|
verbose = old_verbose;
|
|
if (err) {
|
|
if (!verbose)
|
|
fprintf(stderr, " (use -v to see error message)");
|
|
return -1;
|
|
}
|
|
|
|
err = test__bpf_parsing(obj_buf, obj_buf_sz);
|
|
free(obj_buf);
|
|
return err;
|
|
}
|