| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <1444826502-49291-29-git-send-email-wangnan0@huawei.com>
Date: Wed, 14 Oct 2015 12:41:39 +0000
From: Wang Nan <wangnan0@...wei.com>
To: <acme@...nel.org>, <ast@...mgrid.com>, <brendan.d.gregg@...il.com>
CC: <a.p.zijlstra@...llo.nl>, <daniel@...earbox.net>,
<dsahern@...il.com>, <hekuang@...wei.com>, <jolsa@...nel.org>,
<lizefan@...wei.com>, <masami.hiramatsu.pt@...achi.com>,
<namhyung@...nel.org>, <paulus@...ba.org>,
<linux-kernel@...r.kernel.org>, <pi3orama@....com>,
<xiakaixu@...wei.com>, Wang Nan <wangnan0@...wei.com>,
Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: [PATCH 28/31] perf tools: Add API to config maps in bpf object
bpf__config_obj() is introduced as a core API to config BPF object
after loading. One configuration option of maps is introduced. After
this patch BPF object can accept configuration like:
maps.my_pmy.event=evt
Where evt is a predefined event with alias "evt".
Signed-off-by: Wang Nan <wangnan0@...wei.com>
Signed-off-by: He Kuang <hekuang@...wei.com>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Alexei Starovoitov <ast@...mgrid.com>
Cc: Brendan Gregg <brendan.d.gregg@...il.com>
Cc: Daniel Borkmann <daniel@...earbox.net>
Cc: David Ahern <dsahern@...il.com>
Cc: He Kuang <hekuang@...wei.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Kaixu Xia <xiakaixu@...wei.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Zefan Li <lizefan@...wei.com>
Cc: pi3orama@....com
Link: http://lkml.kernel.org/n/ebpf-36xcrahy9n0ayc05mu7aajpk@git.kernel.org
---
tools/perf/util/bpf-loader.c | 147 +++++++++++++++++++++++++++++++++++++++++++
tools/perf/util/bpf-loader.h | 39 ++++++++++++
2 files changed, 186 insertions(+)
diff --git a/tools/perf/util/bpf-loader.c b/tools/perf/util/bpf-loader.c
index 73ff9a9..b92c2f7 100644
--- a/tools/perf/util/bpf-loader.c
+++ b/tools/perf/util/bpf-loader.c
@@ -10,6 +10,7 @@
#include <linux/err.h>
#include "perf.h"
#include "debug.h"
+#include "util.h"
#include "bpf-loader.h"
#include "bpf-prologue.h"
#include "llvm-utils.h"
@@ -633,6 +634,139 @@ int bpf__foreach_tev(struct bpf_object *obj,
return 0;
}
+struct bpf_map_priv {
+ struct perf_evsel *evsel;
+};
+
+static void
+bpf_map_priv__clear(struct bpf_map *map __maybe_unused,
+ void *_priv)
+{
+ struct bpf_map_priv *priv = _priv;
+
+ free(priv);
+}
+
+static int
+bpf__config_obj_map_event(struct bpf_map *map, const char *val,
+ struct perf_evlist *evlist)
+{
+ struct bpf_map_priv *priv;
+ struct perf_evsel *evsel;
+ struct bpf_map_def def;
+ const char *map_name;
+ int err;
+
+ map_name = bpf_map__get_name(map);
+
+ evsel = perf_evlist__find_evsel_by_alias(evlist, val);
+ if (!evsel) {
+ pr_debug("Event '%s' doesn't exist\n", val);
+ return -EINVAL;
+ }
+
+ err = bpf_map__get_def(map, &def);
+ if (err) {
+ pr_debug("Unable to get map definition from '%s'\n",
+ map_name);
+ return -EINVAL;
+ }
+
+ if (def.type != BPF_MAP_TYPE_PERF_EVENT_ARRAY) {
+ pr_debug("Map %s type is not BPF_MAP_TYPE_PERF_EVENT_ARRAY\n",
+ map_name);
+ return -EINVAL;
+ }
+
+ priv = calloc(sizeof(*priv), 1);
+ if (!priv) {
+ pr_debug("No enough memory to alloc map private\n");
+ return -ENOMEM;
+ }
+
+ priv->evsel = evsel;
+ return bpf_map__set_private(map, priv, bpf_map_priv__clear);
+}
+
+struct bpf_config_map_func {
+ const char *config_opt;
+ int (*config_func)(struct bpf_map *, const char *,
+ struct perf_evlist *);
+};
+
+struct bpf_config_map_func bpf_config_map_funcs[] = {
+ {"event", bpf__config_obj_map_event},
+};
+
+static int
+bpf__config_obj_map(struct bpf_object *obj,
+ const char *key,
+ const char *val,
+ struct perf_evlist *evlist)
+{
+ /* key is "maps.<mapname>.<config opt>" */
+ char *map_name = strdup(key + sizeof("maps.") - 1);
+ struct bpf_map *map;
+ int err = -ENOENT;
+ char *map_opt;
+ size_t i;
+
+ if (!map_name)
+ return -ENOMEM;
+
+ map_opt = strchr(map_name, '.');
+ if (!map_opt) {
+ pr_debug("ERROR: Invalid map config: %s\n", map_name);
+ goto out;
+ }
+
+ *map_opt++ = '\0';
+ if (*map_opt == '\0') {
+ pr_debug("ERROR: Invalid map option: %s\n", key);
+ goto out;
+ }
+
+ map = bpf_object__get_map_by_name(obj, map_name);
+ if (!map) {
+ pr_debug("ERROR: Map %s doesn't exist\n", map_name);
+ goto out;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(bpf_config_map_funcs); i++) {
+ struct bpf_config_map_func *func = &bpf_config_map_funcs[i];
+
+ if (strcmp(map_opt, func->config_opt) == 0) {
+ err = func->config_func(map, val, evlist);
+ goto out;
+ }
+ }
+
+ pr_debug("ERROR: invalid config option '%s' for maps\n",
+ map_opt);
+ err = -ENOENT;
+out:
+ free(map_name);
+ return err;
+}
+
+int bpf__config_obj(struct bpf_object *obj,
+ const char *key,
+ struct bpf_config_val *val,
+ struct perf_evlist *evlist)
+{
+ if (!obj || !key || !val)
+ return -ENODEV;
+
+ if (!prefixcmp(key, "maps.")) {
+ if (val->type != BPF_CONFIG_VAL_STRING) {
+ pr_debug("ERROR: incorrect value type\n");
+ return -EINVAL;
+ }
+ return bpf__config_obj_map(obj, key, val->string, evlist);
+ }
+ return -ENODEV;
+}
+
#define bpf__strerror_head(err, buf, size) \
char sbuf[STRERR_BUFSIZE], *emsg;\
if (!size)\
@@ -675,3 +809,16 @@ int bpf__strerror_load(struct bpf_object *obj __maybe_unused,
bpf__strerror_end(buf, size);
return 0;
}
+
+int bpf__strerror_config_obj(struct bpf_object *obj __maybe_unused,
+ const char *key, struct bpf_config_val *val,
+ struct perf_evlist *evlist __maybe_unused,
+ int err, char *buf, size_t size)
+{
+ bpf__strerror_head(err, buf, size);
+ bpf__strerror_entry(ENODEV, "Invalid config option: '%s'", key)
+ bpf__strerror_entry(ENOENT, "Config target in '%s' is invalid", key)
+ bpf__strerror_entry(EINVAL, "Invalid config value %s", val)
+ bpf__strerror_end(buf, size);
+ return 0;
+}
diff --git a/tools/perf/util/bpf-loader.h b/tools/perf/util/bpf-loader.h
index d8f1945..4c99b21 100644
--- a/tools/perf/util/bpf-loader.h
+++ b/tools/perf/util/bpf-loader.h
@@ -9,6 +9,7 @@
#include <linux/err.h>
#include <string.h>
#include "probe-event.h"
+#include "evlist.h"
#include "debug.h"
struct bpf_object;
@@ -17,6 +18,17 @@ struct bpf_object;
typedef int (*bpf_prog_iter_callback_t)(struct probe_trace_event *tev,
int fd, void *arg);
+struct bpf_config_val {
+ enum {
+ BPF_CONFIG_VAL_STRING,
+ BPF_CONFIG_VAL_NUM,
+ } type;
+ union {
+ const char *string;
+ unsigned long long num;
+ };
+};
+
#ifdef HAVE_LIBBPF_SUPPORT
struct bpf_object *bpf__prepare_load(const char *filename, bool source);
struct bpf_object *bpf__prepare_load_buffer(void *obj_buf, size_t obj_buf_sz,
@@ -34,6 +46,13 @@ int bpf__strerror_load(struct bpf_object *obj, int err,
char *buf, size_t size);
int bpf__foreach_tev(struct bpf_object *obj,
bpf_prog_iter_callback_t func, void *arg);
+
+int bpf__config_obj(struct bpf_object *obj, const char *key,
+ struct bpf_config_val *val, struct perf_evlist *evlist);
+int bpf__strerror_config_obj(struct bpf_object *obj,
+ const char *key, struct bpf_config_val *val,
+ struct perf_evlist *evlist,
+ int err, char *buf, size_t size);
#else
static inline struct bpf_object *
bpf__prepare_load(const char *filename __maybe_unused,
@@ -65,6 +84,15 @@ bpf__foreach_tev(struct bpf_object *obj __maybe_unused,
}
static inline int
+bpf__config_obj(struct bpf_object *obj __maybe_unused,
+ const char *key __maybe_unused,
+ struct bpf_config_val *val __maybe_unused,
+ struct perf_evlist *evlist __maybe_unused)
+{
+ return 0;
+}
+
+static inline int
__bpf_strerror(char *buf, size_t size)
{
if (!size)
@@ -90,5 +118,16 @@ static inline int bpf__strerror_load(struct bpf_object *obj __maybe_unused,
{
return __bpf_strerror(buf, size);
}
+
+static inline int
+bpf__strerror_config_obj(struct bpf_object *obj __maybe_unused,
+ const char *key __maybe_unused,
+ struct bpf_config_val *val __maybe_unused,
+ struct perf_evlist *evlist __maybe_unused,
+ int err __maybe_unused,
+ char *buf, size_t size)
+{
+ return __bpf_strerror(buf, size);
+}
#endif
#endif
--
1.8.3.4
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists