From patchwork Mon Feb 22 00:05:24 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michal Kubecek X-Patchwork-Id: 386094 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DC0E0C433E0 for ; Mon, 22 Feb 2021 00:11:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9B03A64DB1 for ; Mon, 22 Feb 2021 00:11:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229973AbhBVAGI (ORCPT ); Sun, 21 Feb 2021 19:06:08 -0500 Received: from mx2.suse.de ([195.135.220.15]:51718 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229717AbhBVAGG (ORCPT ); Sun, 21 Feb 2021 19:06:06 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id ADB1AAC6F; Mon, 22 Feb 2021 00:05:24 +0000 (UTC) Received: by lion.mk-sys.cz (Postfix, from userid 1000) id 867886079B; Mon, 22 Feb 2021 01:05:24 +0100 (CET) Message-Id: <87e48543d091a6851ba1bd62c6fb79cf11a478de.1613952250.git.mkubecek@suse.cz> From: Michal Kubecek Subject: [PATCH ethtool] ioctl: less confusing error message for master-slave parameter To: netdev@vger.kernel.org Cc: Bruce LIU Date: Mon, 22 Feb 2021 01:05:24 +0100 (CET) Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org The fallback code issues a reasonable error message when a subcommand implemented only via netlink would end up being processed by ioctl code, e.g. because a new ethtool runs on an older kernel without netlink support. But when a netlink only parameter is passed to subcommand which is recognized by ioctl code in general, it is handled as an unknown one. At the the moment, there is only one such parameter: master-slave for '-s' subcommand. As it is not handled by the generic command line parser, address this with a quick fix and leave updating the generic parser for later. Reported-by: Bruce LIU Signed-off-by: Michal Kubecek --- ethtool.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/ethtool.c b/ethtool.c index fb90e9e456b9..15e9d34831b3 100644 --- a/ethtool.c +++ b/ethtool.c @@ -72,6 +72,16 @@ static void exit_bad_args(void) exit(1); } +static void exit_nlonly_param(const char *name) __attribute__((noreturn)); + +static void exit_nlonly_param(const char *name) +{ + fprintf(stderr, + "ethtool: parameter '%s' can be used only with netlink\n", + name); + exit(1); +} + typedef enum { CMDL_NONE, CMDL_BOOL, @@ -3066,6 +3076,8 @@ static int do_sset(struct cmd_context *ctx) ARRAY_SIZE(cmdline_msglvl)); break; } + } else if (!strcmp(argp[i], "master-slave")) { + exit_nlonly_param(argp[i]); } else { exit_bad_args(); }