From mboxrd@z Thu Jan 1 00:00:00 1970 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=-10.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT 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 96C4FC433E5 for ; Wed, 26 Aug 2020 12:03:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7766C20786 for ; Wed, 26 Aug 2020 12:03:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598443397; bh=rG3PYJLfKC9NUtVeihfVocRKM2NrWLJZSdMjvohnzyM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=wL5U44w/5mde1pYlKLfdVtCGdVWn7CbO33zOX7stKqgQ2sTKxjC+uEhquj8BKP4Iu A2Vaj3nd/P13UnM/DQ1BsKPTThIalkfeNuRNkAfQ2IZP2hRhzQ7lj6yfKnoKiNXSUK 73BngTHGlUHBBYyPKNlM+Mcl4jDi7jZip4q8nv3c= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729425AbgHZMDQ (ORCPT ); Wed, 26 Aug 2020 08:03:16 -0400 Received: from mail.kernel.org ([198.145.29.99]:37950 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729507AbgHZMDL (ORCPT ); Wed, 26 Aug 2020 08:03:11 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id CDCE92087C; Wed, 26 Aug 2020 12:03:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598443390; bh=rG3PYJLfKC9NUtVeihfVocRKM2NrWLJZSdMjvohnzyM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=iXzCq+e4od6XWrscLO58TNpK2rYUxlkL1pSGuFzmel8gNtzcVXYmrbRxrohLB/uIF TPZhT14Q37XKlAblaqbQRfYpobaR7iU5/q9g7y/sw2ShNNiWQWVdHD3KBOiGBw8wK/ hRKtjMODrRzq88KmAJjFd9B76hIw2voxCUPJfMGw= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Maxim Mikityanskiy , Michal Kubecek , "David S. Miller" Subject: [PATCH 5.7 11/15] ethtool: Fix preserving of wanted feature bits in netlink interface Date: Wed, 26 Aug 2020 14:02:39 +0200 Message-Id: <20200826114849.847729571@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200826114849.295321031@linuxfoundation.org> References: <20200826114849.295321031@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Maxim Mikityanskiy [ Upstream commit 840110a4eae190dcbb9907d68216d5d1d9f25839 ] Currently, ethtool-netlink calculates new wanted bits as: (req_wanted & req_mask) | (old_active & ~req_mask) It completely discards the old wanted bits, so they are forgotten with the next ethtool command. Sample steps to reproduce: 1. ethtool -k eth0 tx-tcp-segmentation: on # TSO is on from the beginning 2. ethtool -K eth0 tx off tx-tcp-segmentation: off [not requested] 3. ethtool -k eth0 tx-tcp-segmentation: off [requested on] 4. ethtool -K eth0 rx off # Some change unrelated to TSO 5. ethtool -k eth0 tx-tcp-segmentation: off # "Wanted on" is forgotten This commit fixes it by changing the formula to: (req_wanted & req_mask) | (old_wanted & ~req_mask), where old_active was replaced by old_wanted to account for the wanted bits. The shortcut condition for the case where nothing was changed now compares wanted bitmasks, instead of wanted to active. Fixes: 0980bfcd6954 ("ethtool: set netdev features with FEATURES_SET request") Signed-off-by: Maxim Mikityanskiy Reviewed-by: Michal Kubecek Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/ethtool/features.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) --- a/net/ethtool/features.c +++ b/net/ethtool/features.c @@ -224,7 +224,9 @@ int ethnl_set_features(struct sk_buff *s DECLARE_BITMAP(wanted_diff_mask, NETDEV_FEATURE_COUNT); DECLARE_BITMAP(active_diff_mask, NETDEV_FEATURE_COUNT); DECLARE_BITMAP(old_active, NETDEV_FEATURE_COUNT); + DECLARE_BITMAP(old_wanted, NETDEV_FEATURE_COUNT); DECLARE_BITMAP(new_active, NETDEV_FEATURE_COUNT); + DECLARE_BITMAP(new_wanted, NETDEV_FEATURE_COUNT); DECLARE_BITMAP(req_wanted, NETDEV_FEATURE_COUNT); DECLARE_BITMAP(req_mask, NETDEV_FEATURE_COUNT); struct nlattr *tb[ETHTOOL_A_FEATURES_MAX + 1]; @@ -250,6 +252,7 @@ int ethnl_set_features(struct sk_buff *s rtnl_lock(); ethnl_features_to_bitmap(old_active, dev->features); + ethnl_features_to_bitmap(old_wanted, dev->wanted_features); ret = ethnl_parse_bitset(req_wanted, req_mask, NETDEV_FEATURE_COUNT, tb[ETHTOOL_A_FEATURES_WANTED], netdev_features_strings, info->extack); @@ -261,11 +264,11 @@ int ethnl_set_features(struct sk_buff *s goto out_rtnl; } - /* set req_wanted bits not in req_mask from old_active */ + /* set req_wanted bits not in req_mask from old_wanted */ bitmap_and(req_wanted, req_wanted, req_mask, NETDEV_FEATURE_COUNT); - bitmap_andnot(new_active, old_active, req_mask, NETDEV_FEATURE_COUNT); - bitmap_or(req_wanted, new_active, req_wanted, NETDEV_FEATURE_COUNT); - if (bitmap_equal(req_wanted, old_active, NETDEV_FEATURE_COUNT)) { + bitmap_andnot(new_wanted, old_wanted, req_mask, NETDEV_FEATURE_COUNT); + bitmap_or(req_wanted, new_wanted, req_wanted, NETDEV_FEATURE_COUNT); + if (bitmap_equal(req_wanted, old_wanted, NETDEV_FEATURE_COUNT)) { ret = 0; goto out_rtnl; }