From patchwork Fri Aug 18 14:15:06 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Mark Cave-Ayland X-Patchwork-Id: 9909209 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id F0575602C8 for ; Fri, 18 Aug 2017 14:22:27 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id DF6CB28CCB for ; Fri, 18 Aug 2017 14:22:27 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D453628CDC; Fri, 18 Aug 2017 14:22:27 +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=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 6198728CCB for ; Fri, 18 Aug 2017 14:22:27 +0000 (UTC) Received: from localhost ([::1]:57116 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1diiAM-0003P7-Kk for patchwork-qemu-devel@patchwork.kernel.org; Fri, 18 Aug 2017 10:22:26 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:54957) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dii3p-0006Pi-9R for qemu-devel@nongnu.org; Fri, 18 Aug 2017 10:15:42 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dii3l-0006N5-95 for qemu-devel@nongnu.org; Fri, 18 Aug 2017 10:15:41 -0400 Received: from chuckie.co.uk ([82.165.15.123]:57467 helo=s16892447.onlinehome-server.info) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1dii3l-00068E-1h for qemu-devel@nongnu.org; Fri, 18 Aug 2017 10:15:37 -0400 Received: from host86-189-213-185.range86-189.btcentralplus.com ([86.189.213.185] helo=kentang.home) by s16892447.onlinehome-server.info with esmtpsa (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.76) (envelope-from ) id 1dii3c-0000ac-LN; Fri, 18 Aug 2017 15:15:29 +0100 From: Mark Cave-Ayland To: qemu-devel@nongnu.org, jasowang@redhat.com Date: Fri, 18 Aug 2017 15:15:06 +0100 Message-Id: <1503065708-28277-3-git-send-email-mark.cave-ayland@ilande.co.uk> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1503065708-28277-1-git-send-email-mark.cave-ayland@ilande.co.uk> References: <1503065708-28277-1-git-send-email-mark.cave-ayland@ilande.co.uk> X-SA-Exim-Connect-IP: 86.189.213.185 X-SA-Exim-Mail-From: mark.cave-ayland@ilande.co.uk X-SA-Exim-Version: 4.2.1 (built Sun, 08 Jan 2012 02:45:44 +0000) X-SA-Exim-Scanned: Yes (on s16892447.onlinehome-server.info) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [fuzzy] X-Received-From: 82.165.15.123 Subject: [Qemu-devel] [PATCH 2/4] net: introduce net_crc32_le() function X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP This provides a standard ethernet CRC32 little-endian implementation. Signed-off-by: Mark Cave-Ayland Reviewed-by: Philippe Mathieu-Daudé --- include/net/net.h | 2 ++ net/net.c | 22 ++++++++++++++++++++++ 2 files changed, 24 insertions(+) diff --git a/include/net/net.h b/include/net/net.h index 586098c..4afac1a 100644 --- a/include/net/net.h +++ b/include/net/net.h @@ -228,7 +228,9 @@ NetClientState *net_hub_port_find(int hub_id); void qdev_set_nic_properties(DeviceState *dev, NICInfo *nd); #define POLYNOMIAL_BE 0x04c11db6 +#define POLYNOMIAL_LE 0xedb88320 uint32_t net_crc32(const uint8_t *p, int len); +uint32_t net_crc32_le(const uint8_t *p, int len); unsigned compute_mcast_idx(const uint8_t *ep); #define vmstate_offset_macaddr(_state, _field) \ diff --git a/net/net.c b/net/net.c index a856907..c99e705 100644 --- a/net/net.c +++ b/net/net.c @@ -1590,6 +1590,28 @@ uint32_t net_crc32(const uint8_t *p, int len) return crc; } +uint32_t net_crc32_le(const uint8_t *p, int len) +{ + uint32_t crc; + int carry, i, j; + uint8_t b; + + crc = 0xffffffff; + for (i = 0; i < len; i++) { + b = *p++; + for (j = 0; j < 8; j++) { + carry = (crc & 0x1) ^ (b & 0x01); + crc >>= 1; + b >>= 1; + if (carry) { + crc = crc ^ POLYNOMIAL_LE; + } + } + } + + return crc; +} + unsigned compute_mcast_idx(const uint8_t *ep) { return net_crc32(ep, 6) >> 26;