From nobody Tue Dec 16 16:39:25 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id BC2D4C77B61 for ; Mon, 24 Apr 2023 09:10:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231561AbjDXJKY (ORCPT ); Mon, 24 Apr 2023 05:10:24 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49046 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231243AbjDXJKX (ORCPT ); Mon, 24 Apr 2023 05:10:23 -0400 Received: from pv50p00im-ztbu10011701.me.com (pv50p00im-ztbu10011701.me.com [17.58.6.53]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1A2AD10CE for ; Mon, 24 Apr 2023 02:10:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kuroa.me; s=sig1; t=1682327416; bh=M/sdqbR+vlmXk2rHdpf5e5t4auOLHGIgUY1Nd7rPR/A=; h=From:To:Subject:Date:Message-Id:MIME-Version; b=GpFjU0d1PJNfUU4+ujnHyR3HsqaCpMRTKiq0QD3GuY6FR2DQhl11WHsqjxdrQoqP/ q/Ev8MionYo7BiMO94+lHGT9I2dujNYkY8jkgWIgWt2s2t2HupHAdDsEwwLKYGI7vw FdZTuO2pPIYIwKDwpo/XN/ODTgMa0eYj6EO7SfKFVN2QiNC2fg649Noe18lpVZD8lV kTMQTyy7VMg8jXlaxwsCh//kyPWOzPa1K8Wjcof1UWNLIucXPRFzUXTVnZz++nMnbY bFSsrojI2QOaYOoaefJIzqwiETL9BEwaFXtgECYWcPbkQMugDvFrQeWzSByGVfKBTM LWGnt6tEyGD6w== Received: from localhost.localdomain (pv50p00im-dlb-asmtp-mailmevip.me.com [17.56.9.10]) by pv50p00im-ztbu10011701.me.com (Postfix) with ESMTPSA id 256FE7403B6; Mon, 24 Apr 2023 09:10:11 +0000 (UTC) From: Xueming Feng To: Quentin Monnet Cc: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , bpf@vger.kernel.org, linux-kernel@vger.kernel.org, Xueming Feng Subject: [PATCH bpf-next v2] bpftool: Dump map id instead of value for map_of_maps types Date: Mon, 24 Apr 2023 17:09:35 +0800 Message-Id: <20230424090935.52707-1-kuro@kuroa.me> X-Mailer: git-send-email 2.37.1 (Apple Git-137.1) MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Proofpoint-ORIG-GUID: zOockGF0ejbAe429Ws_nol25-ZSefIZ8 X-Proofpoint-GUID: zOockGF0ejbAe429Ws_nol25-ZSefIZ8 X-Proofpoint-Virus-Version: =?UTF-8?Q?vendor=3Dfsecure_engine=3D1.1.170-22c6f66c430a71ce266a39bfe25bc?= =?UTF-8?Q?2903e8d5c8f:6.0.517,18.0.883,17.11.64.514.0000000_definitions?= =?UTF-8?Q?=3D2022-06-21=5F08:2022-06-21=5F01,2022-06-21=5F08,2022-02-23?= =?UTF-8?Q?=5F01_signatures=3D0?= X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 malwarescore=0 bulkscore=0 suspectscore=0 clxscore=1030 adultscore=0 phishscore=0 mlxlogscore=999 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2209130000 definitions=main-2304240081 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" When using `bpftool map dump` in plain format, it is usually more convenient to show the inner map id instead of raw value. Changing this behavior would help with quick debugging with `bpftool`, without disrupting scripted behavior. Since user could dump the inner map with id, and need to convert value. Signed-off-by: Xueming Feng --- Changes in v2: - Fix commit message grammar. - Change `print_uint` to only print to stdout, make `arg` const, and renam= e=20 `n` to `arg_size`. - Make `print_uint` able to take any size of argument up to `unsigned lon= g`,=20 and print it as unsigned decimal. Thanks for the review and suggestions! I have changed my patch accordingly. There is a possibility that `arg_size` is larger than `unsigned long`, but previous review suggested that it should be up to the caller function t= o=20 set `arg_size` correctly. So I didn't add check for that, should I? tools/bpf/bpftool/main.c | 15 +++++++++++++++ tools/bpf/bpftool/main.h | 1 + tools/bpf/bpftool/map.c | 9 +++++++-- 3 files changed, 23 insertions(+), 2 deletions(-) diff --git a/tools/bpf/bpftool/main.c b/tools/bpf/bpftool/main.c index 08d0ac543c67..810c0dc10ecb 100644 --- a/tools/bpf/bpftool/main.c +++ b/tools/bpf/bpftool/main.c @@ -251,6 +251,21 @@ int detect_common_prefix(const char *arg, ...) return 0; } =20 +void print_uint(const void *arg, unsigned int arg_size) +{ + const unsigned char *data =3D arg; + unsigned long val =3D 0ul; + + #if __BYTE_ORDER__ =3D=3D __ORDER_LITTLE_ENDIAN__ + memcpy(&val, data, arg_size); + #else + memcpy((unsigned char *)&val + sizeof(val) - arg_size, + data, arg_size); + #endif + + fprintf(stdout, "%lu", val); +} + void fprint_hex(FILE *f, void *arg, unsigned int n, const char *sep) { unsigned char *data =3D arg; diff --git a/tools/bpf/bpftool/main.h b/tools/bpf/bpftool/main.h index 0ef373cef4c7..0de671423431 100644 --- a/tools/bpf/bpftool/main.h +++ b/tools/bpf/bpftool/main.h @@ -90,6 +90,7 @@ void __printf(1, 2) p_info(const char *fmt, ...); =20 bool is_prefix(const char *pfx, const char *str); int detect_common_prefix(const char *arg, ...); +void print_uint(const void *arg, unsigned int arg_size); void fprint_hex(FILE *f, void *arg, unsigned int n, const char *sep); void usage(void) __noreturn; =20 diff --git a/tools/bpf/bpftool/map.c b/tools/bpf/bpftool/map.c index aaeb8939e137..f5be4c0564cf 100644 --- a/tools/bpf/bpftool/map.c +++ b/tools/bpf/bpftool/map.c @@ -259,8 +259,13 @@ static void print_entry_plain(struct bpf_map_info *inf= o, unsigned char *key, } =20 if (info->value_size) { - printf("value:%c", break_names ? '\n' : ' '); - fprint_hex(stdout, value, info->value_size, " "); + if (map_is_map_of_maps(info->type)) { + printf("id:%c", break_names ? '\n' : ' '); + print_uint(value, info->value_size); + } else { + printf("value:%c", break_names ? '\n' : ' '); + fprint_hex(stdout, value, info->value_size, " "); + } } =20 printf("\n"); --=20 2.37.1 (Apple Git-137.1)