From nobody Tue Feb 10 00:00:53 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 1513909099512127.58193929510435; Thu, 21 Dec 2017 18:18:19 -0800 (PST) Received: from localhost ([::1]:53482 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eSCub-0000E1-6w for importer@patchew.org; Thu, 21 Dec 2017 21:18:13 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:37795) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eSCsQ-0007Mu-T9 for qemu-devel@nongnu.org; Thu, 21 Dec 2017 21:15:59 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1eSCsQ-0000HH-14 for qemu-devel@nongnu.org; Thu, 21 Dec 2017 21:15:58 -0500 Received: from mx1.redhat.com ([209.132.183.28]:57210) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1eSCsP-0000GP-Qn for qemu-devel@nongnu.org; Thu, 21 Dec 2017 21:15:57 -0500 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 038C16A7C3; Fri, 22 Dec 2017 02:15:57 +0000 (UTC) Received: from jason-ThinkPad-T450s.redhat.com (ovpn-12-132.pek2.redhat.com [10.72.12.132]) by smtp.corp.redhat.com (Postfix) with ESMTP id 9240419694; Fri, 22 Dec 2017 02:15:53 +0000 (UTC) From: Jason Wang To: peter.maydell@linaro.org, qemu-devel@nongnu.org Date: Fri, 22 Dec 2017 10:15:23 +0800 Message-Id: <1513908937-16034-5-git-send-email-jasowang@redhat.com> In-Reply-To: <1513908937-16034-1-git-send-email-jasowang@redhat.com> References: <1513908937-16034-1-git-send-email-jasowang@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.27]); Fri, 22 Dec 2017 02:15:57 +0000 (UTC) Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PULL 04/18] 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: , Cc: Jason Wang , Mark Cave-Ayland Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Type: text/plain; charset="utf-8" From: Mark Cave-Ayland 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 Signed-off-by: Jason Wang --- 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); =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 a14dc99..4ecaf80 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 POLYNOMIAL_LE; + } + } + } + + return crc; +} + unsigned compute_mcast_idx(const uint8_t *ep) { return net_crc32(ep, ETH_ALEN) >> 26; --=20 2.7.4