From patchwork Thu Jan 17 10:02:10 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Antoine Tenart X-Patchwork-Id: 10767845 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 80A5117FB for ; Thu, 17 Jan 2019 10:05:23 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 708E62A0FC for ; Thu, 17 Jan 2019 10:05:23 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 649AC2A215; Thu, 17 Jan 2019 10:05:23 +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=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0245B2A10E for ; Thu, 17 Jan 2019 10:05:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727609AbfAQKFI (ORCPT ); Thu, 17 Jan 2019 05:05:08 -0500 Received: from mail.bootlin.com ([62.4.15.54]:60551 "EHLO mail.bootlin.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727173AbfAQKFG (ORCPT ); Thu, 17 Jan 2019 05:05:06 -0500 Received: by mail.bootlin.com (Postfix, from userid 110) id 6AEA720A32; Thu, 17 Jan 2019 11:05:03 +0100 (CET) Received: from localhost (aaubervilliers-681-1-37-87.w90-88.abo.wanadoo.fr [90.88.156.87]) by mail.bootlin.com (Postfix) with ESMTPSA id 456AF206DC; Thu, 17 Jan 2019 11:05:03 +0100 (CET) From: Antoine Tenart To: davem@davemloft.net, alexandre.belloni@bootlin.com, UNGLinuxDriver@microchip.com, ralf@linux-mips.org, paul.burton@mips.com, jhogan@kernel.org Cc: Antoine Tenart , netdev@vger.kernel.org, linux-mips@vger.kernel.org, thomas.petazzoni@bootlin.com, quentin.schulz@bootlin.com, allan.nielsen@microchip.com Subject: [PATCH net-next 6/8] net: mscc: improve the frame header parsing readability Date: Thu, 17 Jan 2019 11:02:10 +0100 Message-Id: <20190117100212.2336-7-antoine.tenart@bootlin.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190117100212.2336-1-antoine.tenart@bootlin.com> References: <20190117100212.2336-1-antoine.tenart@bootlin.com> MIME-Version: 1.0 Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This cosmetic patch improves the frame header parsing readability by introducing a new macro to access and mask its fields. Signed-off-by: Antoine Tenart --- drivers/net/ethernet/mscc/ocelot_board.c | 24 +++++++++++++----------- 1 file changed, 13 insertions(+), 11 deletions(-) diff --git a/drivers/net/ethernet/mscc/ocelot_board.c b/drivers/net/ethernet/mscc/ocelot_board.c index ba7c93c4318a..b85982e5717a 100644 --- a/drivers/net/ethernet/mscc/ocelot_board.c +++ b/drivers/net/ethernet/mscc/ocelot_board.c @@ -16,24 +16,26 @@ #include "ocelot.h" -static int ocelot_parse_ifh(u32 *ifh, struct frame_info *info) +#define IFH_EXTRACT_BITFIELD64(x, o, w) (((x) >> (o)) & GENMASK_ULL((w) - 1, 0)) + +static int ocelot_parse_ifh(u32 *_ifh, struct frame_info *info) { - int i; u8 llen, wlen; + u64 ifh[2]; + + ifh[0] = be64_to_cpu(((__force __be64 *)_ifh)[0]); + ifh[1] = be64_to_cpu(((__force __be64 *)_ifh)[1]); - /* The IFH is in network order, switch to CPU order */ - for (i = 0; i < IFH_LEN; i++) - ifh[i] = ntohl((__force __be32)ifh[i]); + wlen = IFH_EXTRACT_BITFIELD64(ifh[0], 7, 8); + llen = IFH_EXTRACT_BITFIELD64(ifh[0], 15, 6); - wlen = (ifh[1] >> 7) & 0xff; - llen = (ifh[1] >> 15) & 0x3f; info->len = OCELOT_BUFFER_CELL_SZ * wlen + llen - 80; - info->port = (ifh[2] & GENMASK(14, 11)) >> 11; + info->port = IFH_EXTRACT_BITFIELD64(ifh[1], 43, 4); - info->cpuq = (ifh[3] & GENMASK(27, 20)) >> 20; - info->tag_type = (ifh[3] & BIT(16)) >> 16; - info->vid = ifh[3] & GENMASK(11, 0); + info->cpuq = IFH_EXTRACT_BITFIELD64(ifh[1], 20, 8); + info->tag_type = IFH_EXTRACT_BITFIELD64(ifh[1], 16, 1); + info->vid = IFH_EXTRACT_BITFIELD64(ifh[1], 0, 12); return 0; }