From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760970AbcLASF1 (ORCPT ); Thu, 1 Dec 2016 13:05:27 -0500 Received: from merlin.infradead.org ([205.233.59.134]:49716 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759691AbcLASDF (ORCPT ); Thu, 1 Dec 2016 13:03:05 -0500 From: Arnaldo Carvalho de Melo To: Ingo Molnar Cc: linux-kernel@vger.kernel.org, Wang Nan , He Kuang , Jiri Olsa , Joe Stringer , Zefan Li , pi3orama@163.com, Arnaldo Carvalho de Melo Subject: [PATCH 07/19] tools lib bpf: Retrive bpf_map through offset of bpf_map_def Date: Thu, 1 Dec 2016 15:02:23 -0300 Message-Id: <20161201180235.18392-8-acme@kernel.org> X-Mailer: git-send-email 2.9.3 In-Reply-To: <20161201180235.18392-1-acme@kernel.org> References: <20161201180235.18392-1-acme@kernel.org> X-SRS-Rewrite: SMTP reverse-path rewritten from by merlin.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Wang Nan Add a new API to libbpf, caller is able to get bpf_map through the offset of bpf_map_def to 'maps' section. The API will be used to help jitted perf hook code find fd of a map. Signed-off-by: Wang Nan Acked-by: Alexei Starovoitov Cc: He Kuang Cc: Jiri Olsa Cc: Joe Stringer Cc: Zefan Li Cc: pi3orama@163.com Link: http://lkml.kernel.org/r/20161126070354.141764-4-wangnan0@huawei.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/lib/bpf/libbpf.c | 12 ++++++++++++ tools/lib/bpf/libbpf.h | 8 ++++++++ 2 files changed, 20 insertions(+) diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index 866d5cdeffc7..2e974593f3e8 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -1524,3 +1524,15 @@ bpf_object__find_map_by_name(struct bpf_object *obj, const char *name) } return NULL; } + +struct bpf_map * +bpf_object__find_map_by_offset(struct bpf_object *obj, size_t offset) +{ + int i; + + for (i = 0; i < obj->nr_maps; i++) { + if (obj->maps[i].offset == offset) + return &obj->maps[i]; + } + return ERR_PTR(-ENOENT); +} diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h index 0c0b0127e03e..a5a8b86a06fe 100644 --- a/tools/lib/bpf/libbpf.h +++ b/tools/lib/bpf/libbpf.h @@ -24,6 +24,7 @@ #include #include #include +#include // for size_t enum libbpf_errno { __LIBBPF_ERRNO__START = 4000, @@ -200,6 +201,13 @@ struct bpf_map; struct bpf_map * bpf_object__find_map_by_name(struct bpf_object *obj, const char *name); +/* + * Get bpf_map through the offset of corresponding struct bpf_map_def + * in the bpf object file. + */ +struct bpf_map * +bpf_object__find_map_by_offset(struct bpf_object *obj, size_t offset); + struct bpf_map * bpf_map__next(struct bpf_map *map, struct bpf_object *obj); #define bpf_map__for_each(pos, obj) \ -- 2.9.3