From: Wang Nan <wangnan0@huawei.com>
To: <acme@kernel.org>, <ast@plumgrid.com>
Cc: <linux-kernel@vger.kernel.org>, <lizefan@huawei.com>,
<hekuang@huawei.com>, <xiakaixu@huawei.com>, <pi3orama@163.com>
Subject: [PATCH v11 20/39] bpf tools: Introduce accessors for struct bpf_program
Date: Wed, 8 Jul 2015 13:14:09 +0000 [thread overview]
Message-ID: <1436361268-234530-21-git-send-email-wangnan0@huawei.com> (raw)
In-Reply-To: <1436361268-234530-1-git-send-email-wangnan0@huawei.com>
This patch introduces accessors for user of libbpf to retrieve section
name and fd of a opened/loaded eBPF program. 'struct bpf_prog_handler'
is used for that purpose. Accessors of programs section name and file
descriptor are provided. Set/get private data are also impelmented.
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: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Zefan Li <lizefan@huawei.com>
Cc: acme@kernel.org
Link: http://lkml.kernel.org/r/1435716878-189507-21-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/lib/bpf/libbpf.c | 82 ++++++++++++++++++++++++++++++++++++++++++++++++++
tools/lib/bpf/libbpf.h | 25 +++++++++++++++
2 files changed, 107 insertions(+)
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index d826d5b..b1575c4 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -98,6 +98,10 @@ struct bpf_program {
int nr_reloc;
int fd;
+
+ struct bpf_object *obj;
+ void *priv;
+ bpf_program_clear_priv_t clear_priv;
};
struct bpf_object {
@@ -150,6 +154,12 @@ static void bpf_program__clear(struct bpf_program *prog)
if (!prog)
return;
+ if (prog->clear_priv)
+ prog->clear_priv(prog, prog->priv);
+
+ prog->priv = NULL;
+ prog->clear_priv = NULL;
+
bpf_program__unload(prog);
zfree(&prog->section_name);
zfree(&prog->insns);
@@ -224,6 +234,7 @@ bpf_program__new(struct bpf_object *obj, void *data, size_t size,
obj->programs = progs;
obj->nr_programs = nr_progs + 1;
+ prog.obj = obj;
progs[nr_progs] = prog;
return &progs[nr_progs];
}
@@ -934,3 +945,74 @@ void bpf_object__close(struct bpf_object *obj)
free(obj);
}
+
+struct bpf_program *
+bpf_program__next(struct bpf_program *prev, struct bpf_object *obj)
+{
+ size_t idx;
+
+ if (!obj->programs)
+ return NULL;
+ /* First handler */
+ if (prev == NULL)
+ return &obj->programs[0];
+
+ if (prev->obj != obj) {
+ pr_warning("error: program handler doesn't match object\n");
+ return NULL;
+ }
+
+ idx = (prev - obj->programs) + 1;
+ if (idx >= obj->nr_programs)
+ return NULL;
+ return &obj->programs[idx];
+}
+
+int bpf_program__set_private(struct bpf_program *prog,
+ void *priv,
+ bpf_program_clear_priv_t clear_priv)
+{
+ if (prog->priv && prog->clear_priv)
+ prog->clear_priv(prog, prog->priv);
+
+ prog->priv = priv;
+ prog->clear_priv = clear_priv;
+ return 0;
+}
+
+int bpf_program__get_private(struct bpf_program *prog, void **ppriv)
+{
+ *ppriv = prog->priv;
+ return 0;
+}
+
+int bpf_program__get_title(struct bpf_program *prog,
+ const char **ptitle, bool dup)
+{
+ const char *title;
+
+ if (!ptitle)
+ return -EINVAL;
+
+ title = prog->section_name;
+ if (dup) {
+ title = strdup(title);
+ if (!title) {
+ pr_warning("failed to strdup program title\n");
+ *ptitle = NULL;
+ return -ENOMEM;
+ }
+ }
+
+ *ptitle = title;
+ return 0;
+}
+
+int bpf_program__get_fd(struct bpf_program *prog, int *pfd)
+{
+ if (!pfd)
+ return -EINVAL;
+
+ *pfd = prog->fd;
+ return 0;
+}
diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
index 3e69600..9e0e102 100644
--- a/tools/lib/bpf/libbpf.h
+++ b/tools/lib/bpf/libbpf.h
@@ -9,6 +9,7 @@
#define __BPF_LIBBPF_H
#include <stdio.h>
+#include <stdbool.h>
/*
* In include/linux/compiler-gcc.h, __printf is defined. However
@@ -34,6 +35,30 @@ void bpf_object__close(struct bpf_object *object);
int bpf_object__load(struct bpf_object *obj);
int bpf_object__unload(struct bpf_object *obj);
+/* Accessors of bpf_program. */
+struct bpf_program;
+struct bpf_program *bpf_program__next(struct bpf_program *prog,
+ struct bpf_object *obj);
+
+#define bpf_object__for_each_program(pos, obj) \
+ for ((pos) = bpf_program__next(NULL, (obj)); \
+ (pos) != NULL; \
+ (pos) = bpf_program__next((pos), (obj)))
+
+typedef void (*bpf_program_clear_priv_t)(struct bpf_program *,
+ void *);
+
+int bpf_program__set_private(struct bpf_program *prog, void *priv,
+ bpf_program_clear_priv_t clear_priv);
+
+int bpf_program__get_private(struct bpf_program *prog,
+ void **ppriv);
+
+int bpf_program__get_title(struct bpf_program *prog,
+ const char **ptitle, bool dup);
+
+int bpf_program__get_fd(struct bpf_program *prog, int *pfd);
+
/*
* We don't need __attribute__((packed)) now since it is
* unnecessary for 'bpf_map_def' because they are all aligned.
--
1.8.3.4
next prev parent reply other threads:[~2015-07-08 13:25 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-08 13:13 [PATCH v11 00/39] perf tools: filtering events using eBPF programs - part1 Wang Nan
2015-07-08 13:13 ` [PATCH v11 01/39] bpf: Use correct #ifdef controller for trace_call_bpf() Wang Nan
2015-07-08 13:13 ` [PATCH v11 02/39] tracing, perf: Implement BPF programs attached to uprobes Wang Nan
2015-07-08 13:13 ` [PATCH v11 03/39] bpf tools: Introduce 'bpf' library and add bpf feature check Wang Nan
2015-07-08 13:13 ` [PATCH v11 04/39] bpf tools: Allow caller to set printing function Wang Nan
2015-07-08 13:13 ` [PATCH v11 05/39] bpf tools: Open eBPF object file and do basic validation Wang Nan
2015-07-08 13:13 ` [PATCH v11 06/39] bpf tools: Read eBPF object from buffer Wang Nan
2015-07-08 13:13 ` [PATCH v11 07/39] bpf tools: Check endianness and make libbpf fail early Wang Nan
2015-07-08 13:13 ` [PATCH v11 08/39] bpf tools: Iterate over ELF sections to collect information Wang Nan
2015-07-08 13:13 ` [PATCH v11 09/39] bpf tools: Collect version and license from ELF sections Wang Nan
2015-07-08 13:13 ` [PATCH v11 10/39] bpf tools: Collect map definitions from 'maps' section Wang Nan
2015-07-08 13:14 ` [PATCH v11 11/39] bpf tools: Collect symbol table from SHT_SYMTAB section Wang Nan
2015-07-08 13:14 ` [PATCH v11 12/39] bpf tools: Collect eBPF programs from their own sections Wang Nan
2015-07-08 13:14 ` [PATCH v11 13/39] bpf tools: Collect relocation sections from SHT_REL sections Wang Nan
2015-07-08 13:14 ` [PATCH v11 14/39] bpf tools: Record map accessing instructions for each program Wang Nan
2015-07-08 13:14 ` [PATCH v11 15/39] bpf tools: Add bpf.c/h for common bpf operations Wang Nan
2015-07-08 13:14 ` [PATCH v11 16/39] bpf tools: Create eBPF maps defined in an object file Wang Nan
2015-07-08 13:14 ` [PATCH v11 17/39] bpf tools: Relocate eBPF programs Wang Nan
2015-07-08 13:14 ` [PATCH v11 18/39] bpf tools: Introduce bpf_load_program() to bpf.c Wang Nan
2015-07-08 13:14 ` [PATCH v11 19/39] bpf tools: Load eBPF programs in object files into kernel Wang Nan
2015-07-08 13:14 ` Wang Nan [this message]
2015-07-08 13:14 ` [PATCH v11 21/39] bpf tools: Introduce accessors for struct bpf_object Wang Nan
2015-07-08 13:14 ` [PATCH v11 22/39] bpf tools: Link all bpf objects onto a list Wang Nan
2015-07-08 13:14 ` [PATCH v11 23/39] perf tools: Introduce llvm config options Wang Nan
2015-07-08 13:14 ` [PATCH v11 24/39] perf tools: Call clang to compile C source to object code Wang Nan
2015-07-08 13:14 ` [PATCH v11 25/39] perf tools: Auto detecting kernel build directory Wang Nan
2015-07-08 13:14 ` [PATCH v11 26/39] perf tools: Auto detecting kernel include options Wang Nan
2015-07-08 13:14 ` [PATCH v11 27/39] perf tests: Add LLVM test for eBPF on-the-fly compiling Wang Nan
2015-07-08 13:14 ` [PATCH v11 28/39] perf tools: Make perf depend on libbpf Wang Nan
2015-07-08 19:44 ` Arnaldo Carvalho de Melo
2015-07-08 13:14 ` [PATCH v11 29/39] perf record: Enable passing bpf object file to --event Wang Nan
2015-07-08 13:14 ` [PATCH v11 30/39] perf record: Compile scriptlets if pass '.c' " Wang Nan
2015-07-08 13:14 ` [PATCH v11 31/39] perf tools: Parse probe points of eBPF programs during preparation Wang Nan
2015-07-08 13:14 ` [PATCH v11 32/39] perf probe: Attach trace_probe_event with perf_probe_event Wang Nan
2015-07-08 13:14 ` [PATCH v11 33/39] perf record: Probe at kprobe points Wang Nan
2015-07-08 13:14 ` [PATCH v11 34/39] perf record: Load all eBPF object into kernel Wang Nan
2015-07-08 13:14 ` [PATCH v11 35/39] perf tools: Add bpf_fd field to evsel and config it Wang Nan
2015-07-08 13:14 ` [PATCH v11 36/39] perf tools: Attach eBPF program to perf event Wang Nan
2015-07-08 13:14 ` [PATCH v11 37/39] perf tools: Suppress probing messages when probing by BPF loading Wang Nan
2015-07-08 13:14 ` [PATCH v11 38/39] perf record: Add clang options for compiling BPF scripts Wang Nan
2015-07-08 13:14 ` [PATCH v11 39/39] bpf tools: Load a program with different instance using preprocessor Wang Nan
2015-07-08 14:03 ` [PATCH v11 00/39] perf tools: filtering events using eBPF programs - part1 Arnaldo Carvalho de Melo
2015-07-08 15:57 ` pi3orama
2015-07-08 19:12 ` Arnaldo Carvalho de Melo
2015-07-08 20:53 ` Arnaldo Carvalho de Melo
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