From patchwork Fri Dec 15 18:41:44 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: 849359 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=2001:4830:134:3::11; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3yyzp34Y27z9sCZ for ; Sat, 16 Dec 2017 05:43:06 +1100 (AEDT) Received: from localhost ([::1]:48119 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ePuwp-00062i-OA for incoming@patchwork.ozlabs.org; Fri, 15 Dec 2017 13:43:03 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:43229) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ePuw5-000626-E8 for qemu-devel@nongnu.org; Fri, 15 Dec 2017 13:42:18 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ePuw2-0006iQ-PZ for qemu-devel@nongnu.org; Fri, 15 Dec 2017 13:42:17 -0500 Received: from chuckie.co.uk ([82.165.15.123]:60817 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 1ePuw2-0006S0-JH for qemu-devel@nongnu.org; Fri, 15 Dec 2017 13:42:14 -0500 Received: from host109-153-37-215.range109-153.btcentralplus.com ([109.153.37.215] 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 1ePuw5-0006JD-Ah; Fri, 15 Dec 2017 18:42:18 +0000 From: Mark Cave-Ayland To: qemu-devel@nongnu.org, jasowang@redhat.com, sw@weilnetz.de Date: Fri, 15 Dec 2017 18:41:44 +0000 Message-Id: <20171215184155.2543-3-mark.cave-ayland@ilande.co.uk> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20171215184155.2543-1-mark.cave-ayland@ilande.co.uk> References: <20171215184155.2543-1-mark.cave-ayland@ilande.co.uk> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 109.153.37.215 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] [PATCHv3 02/13] 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+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" This provides a standard ethernet CRC32 little-endian implementation. Signed-off-by: Mark Cave-Ayland Reviewed-by: Eric Blake 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 586098cb94..4afac1a9dd 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 a14dc9910c..4ecaf80bd1 100644 --- a/net/net.c +++ b/net/net.c @@ -1603,6 +1603,28 @@ 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 ^= POLYNOMIAL_LE; + } + } + } + + return crc; +} + unsigned compute_mcast_idx(const uint8_t *ep) { return net_crc32(ep, ETH_ALEN) >> 26;