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Commit 69d262a9 authored by Wang Nan's avatar Wang Nan Committed by Arnaldo Carvalho de Melo
Browse files

perf ebpf: Add the libbpf glue 



The 'bpf-loader.[ch]' files are introduced in this patch. Which will be
the interface between perf and libbpf. bpf__prepare_load() resides in
bpf-loader.c. Following patches will enrich these two files.

Signed-off-by: default avatarWang Nan <wangnan0@huawei.com>
Acked-by: default avatarAlexei 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/r/1444826502-49291-3-git-send-email-wangnan0@huawei.com


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent ed63f34c

tools/perf/util/bpf-loader.c

0 → 100644
+57 −0
Original line number Diff line number Diff line 
/*

 * bpf-loader.c

 *

 * Copyright (C) 2015 Wang Nan <wangnan0@huawei.com>

 * Copyright (C) 2015 Huawei Inc.

 */



#include <bpf/libbpf.h>

#include <linux/err.h>

#include "perf.h"

#include "debug.h"

#include "bpf-loader.h"



#define DEFINE_PRINT_FN(name, level) \

static int libbpf_##name(const char *fmt, ...)	\

{						\

	va_list args;				\

	int ret;				\

						\

	va_start(args, fmt);			\

	ret = veprintf(level, verbose, pr_fmt(fmt), args);\

	va_end(args);				\

	return ret;				\

}



DEFINE_PRINT_FN(warning, 0)

DEFINE_PRINT_FN(info, 0)

DEFINE_PRINT_FN(debug, 1)



struct bpf_object *bpf__prepare_load(const char *filename)

{

	struct bpf_object *obj;

	static bool libbpf_initialized;



	if (!libbpf_initialized) {

		libbpf_set_print(libbpf_warning,

				 libbpf_info,

				 libbpf_debug);

		libbpf_initialized = true;

	}



	obj = bpf_object__open(filename);

	if (!obj) {

		pr_debug("bpf: failed to load %s\n", filename);

		return ERR_PTR(-EINVAL);

	}



	return obj;

}



void bpf__clear(void)

{

	struct bpf_object *obj, *tmp;



	bpf_object__for_each_safe(obj, tmp)

		bpf_object__close(obj);

}

tools/perf/util/bpf-loader.h

0 → 100644
+29 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2015, Wang Nan <wangnan0@huawei.com>

 * Copyright (C) 2015, Huawei Inc.

 */

#ifndef __BPF_LOADER_H

#define __BPF_LOADER_H



#include <linux/compiler.h>

#include <linux/err.h>

#include <string.h>

#include "debug.h"



struct bpf_object;



#ifdef HAVE_LIBBPF_SUPPORT

struct bpf_object *bpf__prepare_load(const char *filename);



void bpf__clear(void);

#else

static inline struct bpf_object *

bpf__prepare_load(const char *filename __maybe_unused)

{

	pr_debug("ERROR: eBPF object loading is disabled during compiling.\n");

	return ERR_PTR(-ENOTSUP);

}



static inline void bpf__clear(void) { }

#endif

#endif