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[54.225.227.206]) by mx.google.com with ESMTP id w74si7984583ioi.258.2017.09.26.12.01.58; Tue, 26 Sep 2017 12:01:58 -0700 (PDT) Received-SPF: pass (google.com: domain of lng-odp-bounces@lists.linaro.org designates 54.225.227.206 as permitted sender) client-ip=54.225.227.206; Authentication-Results: mx.google.com; spf=pass (google.com: domain of lng-odp-bounces@lists.linaro.org designates 54.225.227.206 as permitted sender) smtp.mailfrom=lng-odp-bounces@lists.linaro.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=yandex.ru Received: by lists.linaro.org (Postfix, from userid 109) id 4900360D6F; Tue, 26 Sep 2017 19:01:58 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on ip-10-142-244-252 X-Spam-Level: X-Spam-Status: No, score=-2.6 required=5.0 tests=BAYES_00,FREEMAIL_FROM, RCVD_IN_DNSWL_LOW,URIBL_BLOCKED autolearn=disabled version=3.4.0 Received: from [127.0.0.1] (localhost [127.0.0.1]) by lists.linaro.org (Postfix) with ESMTP id 74DCF60D83; Tue, 26 Sep 2017 19:00:38 +0000 (UTC) X-Original-To: lng-odp@lists.linaro.org Delivered-To: lng-odp@lists.linaro.org Received: by lists.linaro.org (Postfix, from userid 109) id C8B1960D78; Tue, 26 Sep 2017 19:00:18 +0000 (UTC) Received: from forward106p.mail.yandex.net (forward106p.mail.yandex.net [77.88.28.109]) by lists.linaro.org (Postfix) with ESMTPS id 1E6DD60D72 for ; Tue, 26 Sep 2017 19:00:14 +0000 (UTC) Received: from mxback9j.mail.yandex.net (mxback9j.mail.yandex.net [IPv6:2a02:6b8:0:1619::112]) by forward106p.mail.yandex.net (Yandex) with ESMTP id 9013D2D84584 for ; Tue, 26 Sep 2017 22:00:12 +0300 (MSK) Received: from smtp3o.mail.yandex.net (smtp3o.mail.yandex.net [2a02:6b8:0:1a2d::27]) by mxback9j.mail.yandex.net (nwsmtp/Yandex) with ESMTP id 5dWdrL1SrJ-0CZqGV55; Tue, 26 Sep 2017 22:00:12 +0300 Received: by smtp3o.mail.yandex.net (nwsmtp/Yandex) with ESMTPSA id 7XQL04xJi6-0CLadmqf; Tue, 26 Sep 2017 22:00:12 +0300 (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (Client certificate not present) From: Github ODP bot To: lng-odp@lists.linaro.org Date: Tue, 26 Sep 2017 22:00:06 +0300 Message-Id: <1506452407-23070-3-git-send-email-odpbot@yandex.ru> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1506452407-23070-1-git-send-email-odpbot@yandex.ru> References: <1506452407-23070-1-git-send-email-odpbot@yandex.ru> Github-pr-num: 193 Subject: [lng-odp] [PATCH API-NEXT v2 2/3] linux-gen: chksum: implement ones complement sum X-BeenThere: lng-odp@lists.linaro.org X-Mailman-Version: 2.1.16 Precedence: list List-Id: "The OpenDataPlane \(ODP\) List" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: lng-odp-bounces@lists.linaro.org Sender: "lng-odp" From: Petri Savolainen Add implementation of 16 bit ones complement sum function. This is non-performance optimized but simple and based on RFC 1071 and its errata. Signed-off-by: Petri Savolainen --- /** Email created from pull request 193 (psavol:next-ip-checksum) ** https://github.com/Linaro/odp/pull/193 ** Patch: https://github.com/Linaro/odp/pull/193.patch ** Base sha: e04e5f90df69e3031622b77fb5273b85d47eb966 ** Merge commit sha: 18d37c68b9d3a13db328316de06eed14113d0fc2 **/ platform/linux-generic/Makefile.am | 1 + platform/linux-generic/odp_chksum.c | 36 ++++++++++++++++++++++++++++++++++++ 2 files changed, 37 insertions(+) create mode 100644 platform/linux-generic/odp_chksum.c diff --git a/platform/linux-generic/Makefile.am b/platform/linux-generic/Makefile.am index 994bbbeee..1117e3470 100644 --- a/platform/linux-generic/Makefile.am +++ b/platform/linux-generic/Makefile.am @@ -236,6 +236,7 @@ __LIB__libodp_linux_la_SOURCES = \ odp_bitmap.c \ odp_buffer.c \ odp_byteorder.c \ + odp_chksum.c \ odp_classification.c \ odp_cpu.c \ odp_cpumask.c \ diff --git a/platform/linux-generic/odp_chksum.c b/platform/linux-generic/odp_chksum.c new file mode 100644 index 000000000..349bdaf46 --- /dev/null +++ b/platform/linux-generic/odp_chksum.c @@ -0,0 +1,36 @@ +/* Copyright (c) 2017, Linaro Limited + * All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +#include +#include + +/* Simple implementation of ones complement sum. + * Based on RFC1071 and its errata. + */ +uint16_t odp_chksum_ones_comp16(const void *p, uint32_t len) +{ + uint32_t sum = 0; + const uint16_t *data = p; + + while (len > 1) { + sum += *data++; + len -= 2; + } + + /* Add left-over byte, if any */ + if (len > 0) { + uint16_t left_over; + + *(uint8_t *)&left_over = *(const uint8_t *)data; + sum += left_over; + } + + /* Fold 32-bit sum to 16 bits */ + while (sum >> 16) + sum = (sum & 0xffff) + (sum >> 16); + + return sum; +}