From patchwork Mon May 9 13:18:50 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?b?Q2zDqW1lbnQgTMOpZ2Vy?= X-Patchwork-Id: 12843542 X-Patchwork-Delegate: geert@linux-m68k.org Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D4539C43217 for ; Mon, 9 May 2022 13:20:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235580AbiEINYZ (ORCPT ); Mon, 9 May 2022 09:24:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37230 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235530AbiEINYX (ORCPT ); Mon, 9 May 2022 09:24:23 -0400 Received: from relay10.mail.gandi.net (relay10.mail.gandi.net [217.70.178.230]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 557142B1647; Mon, 9 May 2022 06:20:29 -0700 (PDT) Received: (Authenticated sender: clement.leger@bootlin.com) by mail.gandi.net (Postfix) with ESMTPSA id 24FDA240006; Mon, 9 May 2022 13:20:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1652102428; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=4UyW7TbYwIsoruZbKR9JCyTrq6clfqLl52yRW9sduv4=; b=IsF/cXBjzvKabzEIkzrhLaB/sSeMxTEFaFapeMhx57xv6eSXtJGE5ZIZOIkeBYvvKzLVPA wOBxte94B8BAmOI0L/3t6Tm6fzlQF6NdWw577c/a+zP5NNowK1GOlqVBEOMS5azPidnKjx aYn13Vq6vtTkFX9GCxcySLynxMkrPJl6ddPDHuv0IIK/8qniUisB1BT8rdBUM4aiU6+cQa I0m0FsH6+HRlpVh7v15VSOFo0seHfH/aoMo2T1LFHbJasJq2BjySlgVgGb38+jk+r6wHMR lVgohlEWTqVu5jEixZkSLYTds52behRXH2qLowIPuh9uSwOIr6A98fZsrQKu7Q== From: =?utf-8?b?Q2zDqW1lbnQgTMOpZ2Vy?= To: Andrew Lunn , Vivien Didelot , Florian Fainelli , Vladimir Oltean , "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Rob Herring , Krzysztof Kozlowski , Geert Uytterhoeven , Magnus Damm , Heiner Kallweit , Russell King Cc: =?utf-8?b?Q2zDqW1lbnQgTMOpZ2Vy?= , Thomas Petazzoni , Herve Codina , =?utf-8?q?Miqu=C3=A8l_Raynal?= , Milan Stevanovic , Jimmy Lalande , Pascal Eberhard , linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-renesas-soc@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH net-next v4 02/12] net: dsa: add Renesas RZ/N1 switch tag driver Date: Mon, 9 May 2022 15:18:50 +0200 Message-Id: <20220509131900.7840-3-clement.leger@bootlin.com> X-Mailer: git-send-email 2.36.0 In-Reply-To: <20220509131900.7840-1-clement.leger@bootlin.com> References: <20220509131900.7840-1-clement.leger@bootlin.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-renesas-soc@vger.kernel.org The switch that is present on the Renesas RZ/N1 SoC uses a specific VLAN value followed by 6 bytes which contains forwarding configuration. Signed-off-by: Clément Léger Reviewed-by: Vladimir Oltean Reviewed-by: Florian Fainelli --- include/net/dsa.h | 2 + include/uapi/linux/if_ether.h | 1 + net/dsa/Kconfig | 7 +++ net/dsa/Makefile | 1 + net/dsa/tag_rzn1_a5psw.c | 113 ++++++++++++++++++++++++++++++++++ 5 files changed, 124 insertions(+) create mode 100644 net/dsa/tag_rzn1_a5psw.c diff --git a/include/net/dsa.h b/include/net/dsa.h index d9da32aacbf1..9aaaa7deb102 100644 --- a/include/net/dsa.h +++ b/include/net/dsa.h @@ -53,6 +53,7 @@ struct phylink_link_state; #define DSA_TAG_PROTO_SJA1110_VALUE 23 #define DSA_TAG_PROTO_RTL8_4_VALUE 24 #define DSA_TAG_PROTO_RTL8_4T_VALUE 25 +#define DSA_TAG_PROTO_RZN1_A5PSW_VALUE 26 enum dsa_tag_protocol { DSA_TAG_PROTO_NONE = DSA_TAG_PROTO_NONE_VALUE, @@ -81,6 +82,7 @@ enum dsa_tag_protocol { DSA_TAG_PROTO_SJA1110 = DSA_TAG_PROTO_SJA1110_VALUE, DSA_TAG_PROTO_RTL8_4 = DSA_TAG_PROTO_RTL8_4_VALUE, DSA_TAG_PROTO_RTL8_4T = DSA_TAG_PROTO_RTL8_4T_VALUE, + DSA_TAG_PROTO_RZN1_A5PSW = DSA_TAG_PROTO_RZN1_A5PSW_VALUE, }; struct dsa_switch; diff --git a/include/uapi/linux/if_ether.h b/include/uapi/linux/if_ether.h index 1d0bccc3fa54..d370165bc621 100644 --- a/include/uapi/linux/if_ether.h +++ b/include/uapi/linux/if_ether.h @@ -116,6 +116,7 @@ #define ETH_P_QINQ3 0x9300 /* deprecated QinQ VLAN [ NOT AN OFFICIALLY REGISTERED ID ] */ #define ETH_P_EDSA 0xDADA /* Ethertype DSA [ NOT AN OFFICIALLY REGISTERED ID ] */ #define ETH_P_DSA_8021Q 0xDADB /* Fake VLAN Header for DSA [ NOT AN OFFICIALLY REGISTERED ID ] */ +#define ETH_P_DSA_A5PSW 0xE001 /* A5PSW Tag Value [ NOT AN OFFICIALLY REGISTERED ID ] */ #define ETH_P_IFE 0xED3E /* ForCES inter-FE LFB type */ #define ETH_P_AF_IUCV 0xFBFB /* IBM af_iucv [ NOT AN OFFICIALLY REGISTERED ID ] */ diff --git a/net/dsa/Kconfig b/net/dsa/Kconfig index 8cb87b5067ee..63853fff4e2f 100644 --- a/net/dsa/Kconfig +++ b/net/dsa/Kconfig @@ -132,6 +132,13 @@ config NET_DSA_TAG_RTL8_4 Say Y or M if you want to enable support for tagging frames for Realtek switches with 8 byte protocol 4 tags, such as the Realtek RTL8365MB-VC. +config NET_DSA_TAG_RZN1_A5PSW + tristate "Tag driver for Renesas RZ/N1 A5PSW switch" + help + Say Y or M if you want to enable support for tagging frames for + Renesas RZ/N1 embedded switch that uses an 8 byte tag located after + destination MAC address. + config NET_DSA_TAG_LAN9303 tristate "Tag driver for SMSC/Microchip LAN9303 family of switches" help diff --git a/net/dsa/Makefile b/net/dsa/Makefile index 9f75820e7c98..af28c24ead18 100644 --- a/net/dsa/Makefile +++ b/net/dsa/Makefile @@ -17,6 +17,7 @@ obj-$(CONFIG_NET_DSA_TAG_OCELOT_8021Q) += tag_ocelot_8021q.o obj-$(CONFIG_NET_DSA_TAG_QCA) += tag_qca.o obj-$(CONFIG_NET_DSA_TAG_RTL4_A) += tag_rtl4_a.o obj-$(CONFIG_NET_DSA_TAG_RTL8_4) += tag_rtl8_4.o +obj-$(CONFIG_NET_DSA_TAG_RZN1_A5PSW) += tag_rzn1_a5psw.o obj-$(CONFIG_NET_DSA_TAG_SJA1105) += tag_sja1105.o obj-$(CONFIG_NET_DSA_TAG_TRAILER) += tag_trailer.o obj-$(CONFIG_NET_DSA_TAG_XRS700X) += tag_xrs700x.o diff --git a/net/dsa/tag_rzn1_a5psw.c b/net/dsa/tag_rzn1_a5psw.c new file mode 100644 index 000000000000..e2a5ee6ae688 --- /dev/null +++ b/net/dsa/tag_rzn1_a5psw.c @@ -0,0 +1,113 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2022 Schneider Electric + * + * Clément Léger + */ + +#include +#include +#include +#include + +#include "dsa_priv.h" + +/* To define the outgoing port and to discover the incoming port a TAG is + * inserted after Src MAC : + * + * Dest MAC Src MAC TAG Type + * ...| 1 2 3 4 5 6 | 1 2 3 4 5 6 | 1 2 3 4 5 6 7 8 | 1 2 |... + * |<--------------->| + * + * See struct a5psw_tag for layout + */ + +#define ETH_P_DSA_A5PSW 0xE001 +#define A5PSW_TAG_LEN 8 +#define A5PSW_CTRL_DATA_FORCE_FORWARD BIT(0) +/* This is both used for xmit tag and rcv tagging */ +#define A5PSW_CTRL_DATA_PORT GENMASK(3, 0) + +struct a5psw_tag { + __be16 ctrl_tag; + __be16 ctrl_data; + __be16 ctrl_data2_hi; + __be16 ctrl_data2_lo; +}; + +static struct sk_buff *a5psw_tag_xmit(struct sk_buff *skb, struct net_device *dev) +{ + struct dsa_port *dp = dsa_slave_to_port(dev); + struct a5psw_tag *ptag; + u32 data2_val; + + BUILD_BUG_ON(sizeof(*ptag) != A5PSW_TAG_LEN); + + /* The Ethernet switch we are interfaced with needs packets to be at + * least 60 bytes otherwise they will be discarded when they enter the + * switch port logic. + */ + if (__skb_put_padto(skb, ETH_ZLEN, false)) + return NULL; + + /* provide 'A5PSW_TAG_LEN' bytes additional space */ + skb_push(skb, A5PSW_TAG_LEN); + + /* make room between MACs and Ether-Type to insert tag */ + dsa_alloc_etype_header(skb, A5PSW_TAG_LEN); + + ptag = dsa_etype_header_pos_tx(skb); + + data2_val = FIELD_PREP(A5PSW_CTRL_DATA_PORT, BIT(dp->index)); + ptag->ctrl_tag = htons(ETH_P_DSA_A5PSW); + ptag->ctrl_data = htons(A5PSW_CTRL_DATA_FORCE_FORWARD); + ptag->ctrl_data2_lo = htons(data2_val); + ptag->ctrl_data2_hi = 0; + + return skb; +} + +static struct sk_buff *a5psw_tag_rcv(struct sk_buff *skb, + struct net_device *dev) +{ + struct a5psw_tag *tag; + int port; + + if (unlikely(!pskb_may_pull(skb, A5PSW_TAG_LEN))) { + dev_warn_ratelimited(&dev->dev, + "Dropping packet, cannot pull\n"); + return NULL; + } + + tag = dsa_etype_header_pos_rx(skb); + + if (tag->ctrl_tag != htons(ETH_P_DSA_A5PSW)) { + dev_warn_ratelimited(&dev->dev, "Dropping packet due to invalid TAG marker\n"); + return NULL; + } + + port = FIELD_GET(A5PSW_CTRL_DATA_PORT, ntohs(tag->ctrl_data)); + + skb->dev = dsa_master_find_slave(dev, 0, port); + if (!skb->dev) + return NULL; + + skb_pull_rcsum(skb, A5PSW_TAG_LEN); + dsa_strip_etype_header(skb, A5PSW_TAG_LEN); + + dsa_default_offload_fwd_mark(skb); + + return skb; +} + +static const struct dsa_device_ops a5psw_netdev_ops = { + .name = "a5psw", + .proto = DSA_TAG_PROTO_RZN1_A5PSW, + .xmit = a5psw_tag_xmit, + .rcv = a5psw_tag_rcv, + .needed_headroom = A5PSW_TAG_LEN, +}; + +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_A5PSW); +module_dsa_tag_driver(a5psw_netdev_ops);