From patchwork Mon Nov 9 15:36:56 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oliver Hartkopp X-Patchwork-Id: 1396872 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming-netdev@ozlabs.org Delivered-To: patchwork-incoming-netdev@ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=hartkopp.net Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=hartkopp.net header.i=@hartkopp.net header.a=rsa-sha256 header.s=strato-dkim-0002 header.b=OLnUP4d1; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4CVFVl14kbz9s1l for ; Tue, 10 Nov 2020 02:37:35 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729998AbgKIPhd (ORCPT ); Mon, 9 Nov 2020 10:37:33 -0500 Received: from mo4-p02-ob.smtp.rzone.de ([81.169.146.171]:35257 "EHLO mo4-p02-ob.smtp.rzone.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729919AbgKIPhW (ORCPT ); Mon, 9 Nov 2020 10:37:22 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; t=1604936240; s=strato-dkim-0002; d=hartkopp.net; h=References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: X-RZG-CLASS-ID:X-RZG-AUTH:From:Subject:Sender; bh=ecLj+raN9lp+p+BbOBNexizerl00vA8Zu20B0jMAA4Q=; b=OLnUP4d1Nof67INrY7vyiexvjw7JKqEl1oxcaUE13dJP+PNeI5ghFiTYK0q7R+liyQ eNn87QksCnIM+ero28Ed77sRYghbPtQ6pNEemVsEMkoVa2GHHFs2ReEwx65We+XvKsWR 9XvHwn2WC8RZoroJ6Rp0Rihw5h8iv1YV+ouDUgjyITj8lV5SdWXQPUhrYxuDf4ebHQ9y xpc3ZgGW9DXsWsU/B3tSrLms7DNfh08O2dXOPmksX5nG9GgnD13wDSqIgX4bqJldBJ8L PdMSB0H+DQa7wEd2L1Bbty8KJ/zoMO1UtFklOEVi6TC56EoFcXPTm+QachuCHCIEBZuY 83XQ== X-RZG-AUTH: ":P2MHfkW8eP4Mre39l357AZT/I7AY/7nT2yrDxb8mjGrp7owjzFK3JbFk1mS0lu8GW272ZqqIaA==" X-RZG-CLASS-ID: mo00 Received: from silver.lan by smtp.strato.de (RZmta 47.3.3 DYNA|AUTH) with ESMTPSA id V0298cwA9FbE85d (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256 bits)) (Client did not present a certificate); Mon, 9 Nov 2020 16:37:14 +0100 (CET) From: Oliver Hartkopp To: linux-can@vger.kernel.org, mkl@pengutronix.de, mailhol.vincent@wanadoo.fr Cc: netdev@vger.kernel.org, Oliver Hartkopp Subject: [PATCH v5 7/8] can-dev: introduce helpers to access Classical CAN DLC values Date: Mon, 9 Nov 2020 16:36:56 +0100 Message-Id: <20201109153657.17897-8-socketcan@hartkopp.net> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201109153657.17897-1-socketcan@hartkopp.net> References: <20201109153657.17897-1-socketcan@hartkopp.net> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org can_get_len8_dlc: get value to fill len8_dlc at frame reception time can_get_cc_dlc: get DLC value to be written into CAN controller Signed-off-by: Oliver Hartkopp --- include/linux/can/dev.h | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/include/linux/can/dev.h b/include/linux/can/dev.h index e767a96ae075..f25558609d09 100644 --- a/include/linux/can/dev.h +++ b/include/linux/can/dev.h @@ -168,10 +168,29 @@ static inline bool can_is_canfd_skb(const struct sk_buff *skb) { /* the CAN specific type of skb is identified by its data length */ return skb->len == CANFD_MTU; } +/* helper to handle len8_dlc value for Classical CAN raw DLC access */ +static inline u8 can_check_len8_dlc(u32 ctrlmode, u8 len, u8 dlc, u8 ret) +{ + /* return value for len8_dlc only if all conditions apply */ + if ((ctrlmode & CAN_CTRLMODE_CC_LEN8_DLC) && + (len == CAN_MAX_DLEN) && + (dlc > CAN_MAX_DLEN && dlc <= CAN_MAX_RAW_DLC)) + ret = dlc; + + /* no valid len8_dlc value -> return provided default value */ + return ret; +} + +/* get value to fill len8_dlc in struct can_frame at frame reception time */ +#define can_get_len8_dlc(cm, len, dlc) can_check_len8_dlc(cm, len, dlc, 0) + +/* get DLC value to be written into Classical CAN controller at tx time */ +#define can_get_cc_dlc(cm, len, dlc) can_check_len8_dlc(cm, len, dlc, len) + /* helper to define static CAN controller features at device creation time */ static inline void can_set_static_ctrlmode(struct net_device *dev, u32 static_mode) { struct can_priv *priv = netdev_priv(dev);