From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933181AbbFIF7s (ORCPT ); Tue, 9 Jun 2015 01:59:48 -0400 Received: from szxga02-in.huawei.com ([119.145.14.65]:49177 "EHLO szxga02-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751372AbbFIFvK (ORCPT ); Tue, 9 Jun 2015 01:51:10 -0400 From: Wang Nan To: , , , , , , , , , , CC: , , , , Subject: [RFC PATCH v6 09/32] bpf tools: Collect map definitions from 'maps' section Date: Tue, 9 Jun 2015 05:50:13 +0000 Message-ID: <1433829036-23687-10-git-send-email-wangnan0@huawei.com> X-Mailer: git-send-email 1.8.3.4 In-Reply-To: <1433829036-23687-1-git-send-email-wangnan0@huawei.com> References: <1433829036-23687-1-git-send-email-wangnan0@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.107.197.200] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org If maps are used by eBPF programs, corresponding object file(s) should contain a section named 'map'. Which contains map definitions. This patch copies the data of the whole section. Map data parsing should be acted just before map loading. Signed-off-by: Wang Nan Acked-by: Alexei Starovoitov --- tools/lib/bpf/libbpf.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index 3bd183c..3315f00 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -81,6 +81,9 @@ void libbpf_set_print(libbpf_print_fn_t warn, struct bpf_object { char license[64]; u32 kern_version; + void *maps_buf; + size_t maps_buf_sz; + /* * Information when doing elf related work. Only valid if fd * is valid. @@ -249,6 +252,28 @@ bpf_object__init_kversion(struct bpf_object *obj, return 0; } +static int +bpf_object__init_maps(struct bpf_object *obj, void *data, + size_t size) +{ + if (size == 0) { + pr_debug("%s doesn't need map definition\n", + obj->path); + return 0; + } + + obj->maps_buf = malloc(size); + if (!obj->maps_buf) { + pr_warning("malloc maps failed: %s\n", obj->path); + return -ENOMEM; + } + + obj->maps_buf_sz = size; + memcpy(obj->maps_buf, data, size); + pr_debug("maps in %s: %ld bytes\n", obj->path, (long)size); + return 0; +} + static int bpf_object__elf_collect(struct bpf_object *obj) { Elf *elf = obj->efile.elf; @@ -304,6 +329,9 @@ static int bpf_object__elf_collect(struct bpf_object *obj) err = bpf_object__init_kversion(obj, data->d_buf, data->d_size); + else if (strcmp(name, "maps") == 0) + err = bpf_object__init_maps(obj, data->d_buf, + data->d_size); if (err) goto out; } @@ -381,5 +409,6 @@ void bpf_object__close(struct bpf_object *obj) bpf_object__elf_finish(obj); + zfree(&obj->maps_buf); free(obj); } -- 1.8.3.4