From patchwork Fri Oct 18 09:39:28 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oleksij Rempel X-Patchwork-Id: 11197939 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id ADF2A14ED for ; Fri, 18 Oct 2019 09:40:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8EAAE222C5 for ; Fri, 18 Oct 2019 09:40:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2633075AbfJRJkG (ORCPT ); Fri, 18 Oct 2019 05:40:06 -0400 Received: from metis.ext.pengutronix.de ([85.220.165.71]:41695 "EHLO metis.ext.pengutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2442399AbfJRJjq (ORCPT ); Fri, 18 Oct 2019 05:39:46 -0400 Received: from dude.hi.pengutronix.de ([2001:67c:670:100:1d::7]) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1iLOjQ-0006Z9-Ty; Fri, 18 Oct 2019 11:39:36 +0200 Received: from ore by dude.hi.pengutronix.de with local (Exim 4.92) (envelope-from ) id 1iLOjN-0007h7-Il; Fri, 18 Oct 2019 11:39:33 +0200 From: Oleksij Rempel To: Andrew Lunn , Chris Snook , Florian Fainelli , James Hogan , Jay Cliburn , Mark Rutland , Paul Burton , Ralf Baechle , Rob Herring , Vivien Didelot Cc: Oleksij Rempel , Pengutronix Kernel Team , "David S. Miller" , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-mips@vger.kernel.org, Russell King Subject: [PATCH v2 4/5] net: dsa: add support for Atheros AR9331 TAG format Date: Fri, 18 Oct 2019 11:39:28 +0200 Message-Id: <20191018093929.19299-5-o.rempel@pengutronix.de> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191018093929.19299-1-o.rempel@pengutronix.de> References: <20191018093929.19299-1-o.rempel@pengutronix.de> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 2001:67c:670:100:1d::7 X-SA-Exim-Mail-From: ore@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-mips@vger.kernel.org Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org Add support for tag format used in Atheros AR9331 build-in switch. Signed-off-by: Oleksij Rempel --- include/net/dsa.h | 2 + net/dsa/Kconfig | 6 +++ net/dsa/Makefile | 1 + net/dsa/tag_ar9331.c | 97 ++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 106 insertions(+) create mode 100644 net/dsa/tag_ar9331.c diff --git a/include/net/dsa.h b/include/net/dsa.h index 541fb514e31d..89a334e68d42 100644 --- a/include/net/dsa.h +++ b/include/net/dsa.h @@ -42,6 +42,7 @@ struct phylink_link_state; #define DSA_TAG_PROTO_8021Q_VALUE 12 #define DSA_TAG_PROTO_SJA1105_VALUE 13 #define DSA_TAG_PROTO_KSZ8795_VALUE 14 +#define DSA_TAG_PROTO_AR9331_VALUE 15 enum dsa_tag_protocol { DSA_TAG_PROTO_NONE = DSA_TAG_PROTO_NONE_VALUE, @@ -59,6 +60,7 @@ enum dsa_tag_protocol { DSA_TAG_PROTO_8021Q = DSA_TAG_PROTO_8021Q_VALUE, DSA_TAG_PROTO_SJA1105 = DSA_TAG_PROTO_SJA1105_VALUE, DSA_TAG_PROTO_KSZ8795 = DSA_TAG_PROTO_KSZ8795_VALUE, + DSA_TAG_PROTO_AR9331 = DSA_TAG_PROTO_AR9331_VALUE, }; struct packet_type; diff --git a/net/dsa/Kconfig b/net/dsa/Kconfig index 29e2bd5cc5af..617c9607df5f 100644 --- a/net/dsa/Kconfig +++ b/net/dsa/Kconfig @@ -29,6 +29,12 @@ config NET_DSA_TAG_8021Q Drivers which use these helpers should select this as dependency. +config NET_DSA_TAG_AR9331 + tristate "Tag driver for Atheros AR9331 SoC with build-in switch" + help + Say Y or M if you want to enable support for tagging frames for + the Atheros AR9331 SoC with build-in switch. + config NET_DSA_TAG_BRCM_COMMON tristate default n diff --git a/net/dsa/Makefile b/net/dsa/Makefile index 2c6d286f0511..6f77bdb5c40c 100644 --- a/net/dsa/Makefile +++ b/net/dsa/Makefile @@ -5,6 +5,7 @@ dsa_core-y += dsa.o dsa2.o master.o port.o slave.o switch.o # tagging formats obj-$(CONFIG_NET_DSA_TAG_8021Q) += tag_8021q.o +obj-$(CONFIG_NET_DSA_TAG_AR9331) += tag_ar9331.o obj-$(CONFIG_NET_DSA_TAG_BRCM_COMMON) += tag_brcm.o obj-$(CONFIG_NET_DSA_TAG_DSA) += tag_dsa.o obj-$(CONFIG_NET_DSA_TAG_EDSA) += tag_edsa.o diff --git a/net/dsa/tag_ar9331.c b/net/dsa/tag_ar9331.c new file mode 100644 index 000000000000..40265dd75697 --- /dev/null +++ b/net/dsa/tag_ar9331.c @@ -0,0 +1,97 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2019 Pengutronix, Oleksij Rempel + */ + + +#include +#include + +#include "dsa_priv.h" + +#define AR9331_HDR_LEN 2 +#define AR9331_HDR_VERSION 1 + +#define AR9331_HDR_VERSION_MASK GENMASK(15, 14) +#define AR9331_HDR_PRIORITY_MASK GENMASK(13, 12) +#define AR9331_HDR_TYPE_MASK GENMASK(10, 8) +#define AR9331_HDR_BROADCAST BIT(7) +#define AR9331_HDR_FROM_CPU BIT(6) +/* AR9331_HDR_RESERVED - not used or may be version field. + * According to the AR8216 doc it should 0b10. On AR9331 it is 0b11 on RX path + * and should be set to 0b11 to make it work. + */ +#define AR9331_HDR_RESERVED_MASK GENMASK(5, 4) +#define AR9331_HDR_PORT_NUM_MASK GENMASK(3, 0) + +static struct sk_buff *ar9331_tag_xmit(struct sk_buff *skb, + struct net_device *dev) +{ + struct dsa_port *dp = dsa_slave_to_port(dev); + __le16 *phdr; + u16 hdr; + + if (skb_cow_head(skb, 0) < 0) + return NULL; + + phdr = skb_push(skb, AR9331_HDR_LEN); + + hdr = FIELD_PREP(AR9331_HDR_VERSION_MASK, AR9331_HDR_VERSION); + hdr |= AR9331_HDR_FROM_CPU | dp->index; + /* 0b10 for AR8216 and 0b11 for AR9331 */ + hdr |= AR9331_HDR_RESERVED_MASK; + + phdr[0] = cpu_to_le16(hdr); + + return skb; +} + +static struct sk_buff *ar9331_tag_rcv(struct sk_buff *skb, + struct net_device *ndev, + struct packet_type *pt) +{ + u8 ver, port; + u16 hdr; + + if (unlikely(!pskb_may_pull(skb, AR9331_HDR_LEN))) + return NULL; + + hdr = le16_to_cpu(*(__le16 *)skb_mac_header(skb)); + + ver = FIELD_GET(AR9331_HDR_VERSION_MASK, hdr); + if (unlikely(ver != AR9331_HDR_VERSION)) { + netdev_warn_once(ndev, "%s:%i wrong header version 0x%2x\n", + __func__, __LINE__, hdr); + return NULL; + } + + if (unlikely(hdr & AR9331_HDR_FROM_CPU)) { + netdev_warn_once(ndev, "%s:%i packet should not be from cpu 0x%2x\n", + __func__, __LINE__, hdr); + return NULL; + } + + skb_pull(skb, AR9331_HDR_LEN); + skb_set_mac_header(skb, -ETH_HLEN); + + /* Get source port information */ + port = FIELD_GET(AR9331_HDR_PORT_NUM_MASK, hdr); + + skb->dev = dsa_master_find_slave(ndev, 0, port); + if (!skb->dev) + return NULL; + + return skb; +} + +static const struct dsa_device_ops ar9331_netdev_ops = { + .name = "ar9331", + .proto = DSA_TAG_PROTO_AR9331, + .xmit = ar9331_tag_xmit, + .rcv = ar9331_tag_rcv, + .overhead = AR9331_HDR_LEN, +}; + +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_AR9331); +module_dsa_tag_driver(ar9331_netdev_ops);