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=-7.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 07C6AC433E0 for ; Sat, 6 Feb 2021 20:21:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9C83C64E2E for ; Sat, 6 Feb 2021 20:21:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229626AbhBFUVl (ORCPT ); Sat, 6 Feb 2021 15:21:41 -0500 Received: from hqnvemgate24.nvidia.com ([216.228.121.143]:19998 "EHLO hqnvemgate24.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229506AbhBFUVk (ORCPT ); Sat, 6 Feb 2021 15:21:40 -0500 Received: from hqmail.nvidia.com (Not Verified[216.228.121.13]) by hqnvemgate24.nvidia.com (using TLS: TLSv1.2, AES256-SHA) id ; Sat, 06 Feb 2021 12:20:59 -0800 Received: from [172.27.0.22] (172.20.145.6) by HQMAIL107.nvidia.com (172.20.187.13) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Sat, 6 Feb 2021 20:20:58 +0000 Subject: Re: [bug report] net/mlx5: DR, Add STEv1 setters and getters To: Dan Carpenter CC: References: From: Yevgeny Kliteynik Message-ID: <35cbffa9-58bc-c2be-2ec7-12339d12547e@nvidia.com> Date: Sat, 6 Feb 2021 22:20:55 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.6.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset="utf-8"; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Originating-IP: [172.20.145.6] X-ClientProxiedBy: HQMAIL101.nvidia.com (172.20.187.10) To HQMAIL107.nvidia.com (172.20.187.13) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1612642859; bh=ygsHRKlsdVh1ZbHyntZhTYmXpAk1GS8gL02U5y4K880=; h=Subject:To:CC:References:From:Message-ID:Date:User-Agent: MIME-Version:In-Reply-To:Content-Type:Content-Language: Content-Transfer-Encoding:X-Originating-IP:X-ClientProxiedBy; b=COMAGuq5j5q2dkB5GHRerDDaalftqeYNblQtr+BbNqOAZUG7YQlcWX3CkMRkLqXAo SN6tj+nXdRRrlZxtCMy7QolAwRycP+RhN7ulS1KZpHpguVcGqpCCFE0IxW7ldgc9dE +FUBt6WEINzxMJtbly6nqDcJw3b7quv11MEsGNkWIOc3Xvtlhx5yHIhmqlRj6cnal4 hCenLz8JaZ0nakY5ahq2KAU8oDOk8U+FvuSCp9Ff9VbKYP3MsbDf5CEHLdhLC4NOuT NJAfNuEuIVwdIwAj6OnxjcA9nnuy/htLMS+2jz+YfonpCQH+j/Ha5WKk7E3zfad3Cn d4bG0uHMgWczg== Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org On 05-Feb-21 15:02, Dan Carpenter wrote: > > Hello Yevgeny Kliteynik, > > The patch a6098129c781: "net/mlx5: DR, Add STEv1 setters and getters" > from Sep 22, 2020, leads to the following static checker warning: > > drivers/net/ethernet/mellanox/mlx5/core/steering/dr_ste_v1.c:268 dr_ste_v1_get_miss_addr() > warn: potential shift truncation. '0xff (0-255) << 26' > > drivers/net/ethernet/mellanox/mlx5/core/steering/dr_ste_v1.c > 264 static u64 dr_ste_v1_get_miss_addr(u8 *hw_ste_p) > 265 { > 266 u64 index = > 267 (MLX5_GET(ste_match_bwc_v1, hw_ste_p, miss_address_31_6) | > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ > 268 MLX5_GET(ste_match_bwc_v1, hw_ste_p, miss_address_39_32) << 26); > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ > > index is a u64 but the right side is a two u32s. The << 26 can shift > wrap potentially according to Smatch. Thanks Dan, will send a fix shortly. -- YK > 269 > 270 return index << 6; > 271 } > > regards, > dan carpenter >