From patchwork Mon May 23 02:13:50 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jason Wang X-Patchwork-Id: 9131079 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 101E8607D3 for ; Mon, 23 May 2016 02:23:11 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id F124528117 for ; Mon, 23 May 2016 02:23:10 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E5CAC281EB; Mon, 23 May 2016 02:23:10 +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 94C6728117 for ; Mon, 23 May 2016 02:23:10 +0000 (UTC) Received: from localhost ([::1]:45238 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1b4fWP-0006l8-Lp for patchwork-qemu-devel@patchwork.kernel.org; Sun, 22 May 2016 22:23:09 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:49702) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1b4fO4-00085o-JE for qemu-devel@nongnu.org; Sun, 22 May 2016 22:14:33 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1b4fO2-0002h7-F5 for qemu-devel@nongnu.org; Sun, 22 May 2016 22:14:31 -0400 Received: from mx1.redhat.com ([209.132.183.28]:49272) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1b4fO2-0002gz-98 for qemu-devel@nongnu.org; Sun, 22 May 2016 22:14:30 -0400 Received: from int-mx09.intmail.prod.int.phx2.redhat.com (int-mx09.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id E82377F344; Mon, 23 May 2016 02:14:29 +0000 (UTC) Received: from jason-ThinkPad-T450s.redhat.com (vpn1-7-188.pek2.redhat.com [10.72.7.188]) by int-mx09.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u4N2E4x0000739; Sun, 22 May 2016 22:14:27 -0400 From: Jason Wang To: peter.maydell@linaro.org, qemu-devel@nongnu.org Date: Mon, 23 May 2016 10:13:50 +0800 Message-Id: <1463969642-5908-9-git-send-email-jasowang@redhat.com> In-Reply-To: <1463969642-5908-1-git-send-email-jasowang@redhat.com> References: <1463969642-5908-1-git-send-email-jasowang@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.26]); Mon, 23 May 2016 02:14:29 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PULL 08/20] net: Introduce Toeplitz hash calculator 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: Leonid Bloch , Jason Wang , Dmitry Fleytman Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP From: Dmitry Fleytman Reviewed-by: Michael S. Tsirkin Signed-off-by: Dmitry Fleytman Signed-off-by: Leonid Bloch Signed-off-by: Jason Wang --- include/net/checksum.h | 45 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) diff --git a/include/net/checksum.h b/include/net/checksum.h index 7de1acb..dd8b4f6 100644 --- a/include/net/checksum.h +++ b/include/net/checksum.h @@ -18,6 +18,7 @@ #ifndef QEMU_NET_CHECKSUM_H #define QEMU_NET_CHECKSUM_H +#include "qemu/bswap.h" struct iovec; uint32_t net_checksum_add_cont(int len, uint8_t *buf, int seq); @@ -50,4 +51,48 @@ uint32_t net_checksum_add_iov(const struct iovec *iov, const unsigned int iov_cnt, uint32_t iov_off, uint32_t size); +typedef struct toeplitz_key_st { + uint32_t leftmost_32_bits; + uint8_t *next_byte; +} net_toeplitz_key; + +static inline +void net_toeplitz_key_init(net_toeplitz_key *key, uint8_t *key_bytes) +{ + key->leftmost_32_bits = be32_to_cpu(*(uint32_t *)key_bytes); + key->next_byte = key_bytes + sizeof(uint32_t); +} + +static inline +void net_toeplitz_add(uint32_t *result, + uint8_t *input, + uint32_t len, + net_toeplitz_key *key) +{ + register uint32_t accumulator = *result; + register uint32_t leftmost_32_bits = key->leftmost_32_bits; + register uint32_t byte; + + for (byte = 0; byte < len; byte++) { + register uint8_t input_byte = input[byte]; + register uint8_t key_byte = *(key->next_byte++); + register uint8_t bit; + + for (bit = 0; bit < 8; bit++) { + if (input_byte & (1 << 7)) { + accumulator ^= leftmost_32_bits; + } + + leftmost_32_bits = + (leftmost_32_bits << 1) | ((key_byte & (1 << 7)) >> 7); + + input_byte <<= 1; + key_byte <<= 1; + } + } + + key->leftmost_32_bits = leftmost_32_bits; + *result = accumulator; +} + #endif /* QEMU_NET_CHECKSUM_H */