From nobody Wed Feb 11 02:10:09 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (208.118.235.17 [208.118.235.17]) by mx.zohomail.com with SMTPS id 1512461997830199.47488765592618; Tue, 5 Dec 2017 00:19:57 -0800 (PST) Received: from localhost ([::1]:47129 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eM8SB-0005Kx-L4 for importer@patchew.org; Tue, 05 Dec 2017 03:19:47 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:47423) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eM8QT-0004Sd-FJ for qemu-devel@nongnu.org; Tue, 05 Dec 2017 03:18:02 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1eM8QS-0006uD-D6 for qemu-devel@nongnu.org; Tue, 05 Dec 2017 03:18:01 -0500 Received: from chuckie.co.uk ([82.165.15.123]:38192 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 1eM8QS-0006td-7X for qemu-devel@nongnu.org; Tue, 05 Dec 2017 03:18:00 -0500 Received: from host109-155-37-222.range109-155.btcentralplus.com ([109.155.37.222] 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 1eM8Qa-0005WJ-6p; Tue, 05 Dec 2017 08:18:09 +0000 From: Mark Cave-Ayland To: qemu-devel@nongnu.org, jasowang@redhat.com, sw@weilnetz.de Date: Tue, 5 Dec 2017 08:17:41 +0000 Message-Id: <20171205081744.6563-3-mark.cave-ayland@ilande.co.uk> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20171205081744.6563-1-mark.cave-ayland@ilande.co.uk> References: <20171205081744.6563-1-mark.cave-ayland@ilande.co.uk> X-SA-Exim-Connect-IP: 109.155.37.222 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] [PATCHv2 2/5] 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+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" This provides a standard ethernet CRC32 little-endian implementation. Signed-off-by: Mark Cave-Ayland Reviewed-by: Eric Blake Reviewed-by: Philippe Mathieu-Daud=C3=A9 --- 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); =20 #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); =20 #define vmstate_offset_macaddr(_state, _field) \ diff --git a/net/net.c b/net/net.c index 02a567c18f..38008fe8e7 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; } =20 +uint32_t net_crc32_le(const uint8_t *p, int len) +{ + uint32_t crc; + int carry, i, j; + uint8_t b; + + crc =3D 0xffffffff; + for (i =3D 0; i < len; i++) { + b =3D *p++; + for (j =3D 0; j < 8; j++) { + carry =3D (crc & 0x1) ^ (b & 0x01); + crc >>=3D 1; + b >>=3D 1; + if (carry) { + crc =3D crc ^ POLYNOMIAL_LE; + } + } + } + + return crc; +} + unsigned compute_mcast_idx(const uint8_t *ep) { return net_crc32(ep, 6) >> 26; --=20 2.11.0