From patchwork Thu Jul 11 09:31:52 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paolo Pisati X-Patchwork-Id: 11039491 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 88B2C14DB for ; Thu, 11 Jul 2019 09:32:11 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 77A0228A5C for ; Thu, 11 Jul 2019 09:32:11 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 69A0428A5E; Thu, 11 Jul 2019 09:32:11 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FROM,FSL_HELO_FAKE,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 200DA28A5C for ; Thu, 11 Jul 2019 09:32:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728313AbfGKJb7 (ORCPT ); Thu, 11 Jul 2019 05:31:59 -0400 Received: from mail-wm1-f66.google.com ([209.85.128.66]:37801 "EHLO mail-wm1-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727595AbfGKJb6 (ORCPT ); Thu, 11 Jul 2019 05:31:58 -0400 Received: by mail-wm1-f66.google.com with SMTP id f17so4975587wme.2; Thu, 11 Jul 2019 02:31:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=1LhwbybOGre7jhb9MoBzIWHJmyAAMUo2nsbdJ6LEPDI=; b=jsS6iEzOtytBoOqSAZ5cOraY7/ePo0CkCqLcB/EWr/cfw1pzSS+7ubDAGGZ/xbdxWf XYVAKpylTAqSDxl7yOA+TVAwOh2HawvpiJ9MlPmJuQbpCj4GLR5dt4Azjiro58A91oGF lfUXEGJA51Gx0dGK7TG7sbo4VAr2hq+CrIOmA8Ps4JlWrBY6sike0VZ1oNGWtfl1Qi1E hcl4D0gmfLQO7PxOW72X1JmaF4IAIM3KSTGQ/rjUy7Eyh6w7yDv//RyWLjtVcrh5DC2R hQQ5NMJI8KeDogbPLXGqJC2WK+mvLt20F6k1nVGfVhwK+JTYUhFJkLPdkBp55f1XK1x9 41jw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=1LhwbybOGre7jhb9MoBzIWHJmyAAMUo2nsbdJ6LEPDI=; b=hRzAp6cTwLSxLQWzLsJunKKEwpzi7yIODrTR5gLEsj7SXpQcdsfV5RWWYyNPkyTtks OiM19R2TtjGqCRmyo1qNKuuJUe8otq30YDn3qBP8c6OU6vtUWlNiayMNr3sWOCjC0OLE ph/WnL/JyKn0G8m+mLHYhfsoWsviK2gaoHcszBXDaz+H9tf2RlD3HT2LgO37XkcA3Dpg LhZmb0Ju45yI71lgnok1JcHiYqZJwaH1C/4g2Ch6UvMpF9RYEoAtsFLD2akr3kVJEge8 q90DlUA27rcipR6eTWo53Ljv5L6SzigHGOqf37VkHnJEOJ5v/tW9n3K1PlLc/OHTfTEy udaw== X-Gm-Message-State: APjAAAWWe7ccSIXQDRW8TRCv2Ew3hayEZNGIqgUMLKW58f8eQaYBZvl8 GKw8OJgrrf0t+sLDmpvXHk0= X-Google-Smtp-Source: APXvYqyf1KBCXWmcs4e9KK6grFxCC8E+4DCtk19VvviFmeqXyjCavihr8fWs6O3L/pEGYK8ii+HVZw== X-Received: by 2002:a1c:305:: with SMTP id 5mr3306664wmd.101.1562837516292; Thu, 11 Jul 2019 02:31:56 -0700 (PDT) Received: from gmail.com (net-5-95-187-49.cust.vodafonedsl.it. [5.95.187.49]) by smtp.gmail.com with ESMTPSA id y6sm4997438wmd.16.2019.07.11.02.31.55 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 11 Jul 2019 02:31:55 -0700 (PDT) From: Paolo Pisati To: --in-reply-to= <20190710231439.GD32439@tassilo.jf.intel.com>, Alexei Starovoitov , Daniel Borkmann , Martin KaFai Lau , Song Liu , Yonghong Song , "David S . Miller" , Shuah Khan , Jakub Kicinski , Jiong Wang Cc: netdev@vger.kernel.org, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 1/2] bpf: bpf_csum_diff: fold the checksum before returning the value Date: Thu, 11 Jul 2019 11:31:52 +0200 Message-Id: <1562837513-745-2-git-send-email-p.pisati@gmail.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1562837513-745-1-git-send-email-p.pisati@gmail.com> References: <1562837513-745-1-git-send-email-p.pisati@gmail.com> Sender: linux-kselftest-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Paolo Pisati With this change, bpf_csum_diff behave homogeneously among different checksum calculation code / csum_partial() (tested on x86-64, arm64 and arm). Signed-off-by: Paolo Pisati --- net/core/filter.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/core/filter.c b/net/core/filter.c index f615e42cf4ef..8db7f58f1ea1 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -1990,7 +1990,7 @@ BPF_CALL_5(bpf_csum_diff, __be32 *, from, u32, from_size, for (i = 0; i < to_size / sizeof(__be32); i++, j++) sp->diff[j] = to[i]; - return csum_partial(sp->diff, diff_size, seed); + return csum_fold(csum_partial(sp->diff, diff_size, seed)); } static const struct bpf_func_proto bpf_csum_diff_proto = {