From patchwork Wed Oct 28 07:42:14 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kurt Kanzenbach X-Patchwork-Id: 316090 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.8 required=3.0 tests=BAYES_00, DATE_IN_PAST_12_24, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A0C61C4363A for ; Thu, 29 Oct 2020 02:01:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 50F5121534 for ; Thu, 29 Oct 2020 02:01:37 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="DGoQTGWQ"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="Gxgn8plC" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727708AbgJ2CB2 (ORCPT ); Wed, 28 Oct 2020 22:01:28 -0400 Received: from Galois.linutronix.de ([193.142.43.55]:57356 "EHLO galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727808AbgJ1Vt3 (ORCPT ); Wed, 28 Oct 2020 17:49:29 -0400 From: Kurt Kanzenbach DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1603870980; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Df5/YbZrFOqaIYbzo8220XyOTjp/7EsThCBrJYh2Uwo=; b=DGoQTGWQj+lvO7YzJcS/43/F499KzF7CSt+cPUyTA/NcyqdG0v+AVIyguOAjRgrwgEvW7U kI+jCFGmXpnE1IEcVL9yaeuXtS6lz3Uz4tfQ6fe1xrcPO0SMpG7HLaboeJ8spjBKYHwd4j ZCdn1kRZYxO4/DFi295A3mBkvnbmb7Cko3i/abNlwDou3Wm7cP1koJw1462B9eB65d6nL3 TMh5g5vAY5oFoCjZo2eZ5szRFtbSARDMeaAliX+plWi+kn6luvpllma9AaQ5rq/xlM6/9M lerUV2c0ODdWokHqUmR4gVKKKKi+Y1d96NUnjj1qe5a0FG03BizQ4edMfRFrCA== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1603870980; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Df5/YbZrFOqaIYbzo8220XyOTjp/7EsThCBrJYh2Uwo=; b=Gxgn8plCekSg9Fnwn/Q97RSq5pk5z7l/PTD69mm7DoPaRk7QYb11S919XZOHhbEBVcOaHb 6c+n6YWLxXhUg9Cw== To: Andrew Lunn , Vivien Didelot , Florian Fainelli , Vladimir Oltean Cc: "David S. Miller" , Jakub Kicinski , netdev@vger.kernel.org, Rob Herring , devicetree@vger.kernel.org, Sebastian Andrzej Siewior , Richard Cochran , Kamil Alkhouri , ilias.apalodimas@linaro.org, Kurt Kanzenbach Subject: [PATCH net-next v7 1/8] net: dsa: Add tag handling for Hirschmann Hellcreek switches Date: Wed, 28 Oct 2020 08:42:14 +0100 Message-Id: <20201028074221.29326-2-kurt@linutronix.de> In-Reply-To: <20201028074221.29326-1-kurt@linutronix.de> References: <20201028074221.29326-1-kurt@linutronix.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org The Hirschmann Hellcreek TSN switches have a special tagging protocol for frames exchanged between the CPU port and the master interface. The format is a one byte trailer indicating the destination or origin port. It's quite similar to the Micrel KSZ tagging. That's why the implementation is based on that code. Signed-off-by: Kurt Kanzenbach Reviewed-by: Florian Fainelli Reviewed-by: Vladimir Oltean --- include/net/dsa.h | 2 + net/dsa/Kconfig | 6 +++ net/dsa/Makefile | 1 + net/dsa/tag_hellcreek.c | 102 ++++++++++++++++++++++++++++++++++++++++ 4 files changed, 111 insertions(+) create mode 100644 net/dsa/tag_hellcreek.c diff --git a/include/net/dsa.h b/include/net/dsa.h index 35429a140dfa..04e93bafb7bd 100644 --- a/include/net/dsa.h +++ b/include/net/dsa.h @@ -45,6 +45,7 @@ struct phylink_link_state; #define DSA_TAG_PROTO_OCELOT_VALUE 15 #define DSA_TAG_PROTO_AR9331_VALUE 16 #define DSA_TAG_PROTO_RTL4_A_VALUE 17 +#define DSA_TAG_PROTO_HELLCREEK_VALUE 18 enum dsa_tag_protocol { DSA_TAG_PROTO_NONE = DSA_TAG_PROTO_NONE_VALUE, @@ -65,6 +66,7 @@ enum dsa_tag_protocol { DSA_TAG_PROTO_OCELOT = DSA_TAG_PROTO_OCELOT_VALUE, DSA_TAG_PROTO_AR9331 = DSA_TAG_PROTO_AR9331_VALUE, DSA_TAG_PROTO_RTL4_A = DSA_TAG_PROTO_RTL4_A_VALUE, + DSA_TAG_PROTO_HELLCREEK = DSA_TAG_PROTO_HELLCREEK_VALUE, }; struct packet_type; diff --git a/net/dsa/Kconfig b/net/dsa/Kconfig index 1f9b9b11008c..d975614f7dd6 100644 --- a/net/dsa/Kconfig +++ b/net/dsa/Kconfig @@ -56,6 +56,12 @@ config NET_DSA_TAG_BRCM_PREPEND Broadcom switches which places the tag before the Ethernet header (prepended). +config NET_DSA_TAG_HELLCREEK + tristate "Tag driver for Hirschmann Hellcreek TSN switches" + help + Say Y or M if you want to enable support for tagging frames + for the Hirschmann Hellcreek TSN switches. + config NET_DSA_TAG_GSWIP tristate "Tag driver for Lantiq / Intel GSWIP switches" help diff --git a/net/dsa/Makefile b/net/dsa/Makefile index 4f47b2025ff5..e25d5457964a 100644 --- a/net/dsa/Makefile +++ b/net/dsa/Makefile @@ -10,6 +10,7 @@ obj-$(CONFIG_NET_DSA_TAG_BRCM_COMMON) += tag_brcm.o obj-$(CONFIG_NET_DSA_TAG_DSA) += tag_dsa.o obj-$(CONFIG_NET_DSA_TAG_EDSA) += tag_edsa.o obj-$(CONFIG_NET_DSA_TAG_GSWIP) += tag_gswip.o +obj-$(CONFIG_NET_DSA_TAG_HELLCREEK) += tag_hellcreek.o obj-$(CONFIG_NET_DSA_TAG_KSZ) += tag_ksz.o obj-$(CONFIG_NET_DSA_TAG_RTL4_A) += tag_rtl4_a.o obj-$(CONFIG_NET_DSA_TAG_LAN9303) += tag_lan9303.o diff --git a/net/dsa/tag_hellcreek.c b/net/dsa/tag_hellcreek.c new file mode 100644 index 000000000000..3f27f0fa42a3 --- /dev/null +++ b/net/dsa/tag_hellcreek.c @@ -0,0 +1,102 @@ +// SPDX-License-Identifier: (GPL-2.0 OR MIT) +/* + * net/dsa/tag_hellcreek.c - Hirschmann Hellcreek switch tag format handling + * + * Copyright (C) 2019,2020 Linutronix GmbH + * Author Kurt Kanzenbach + * + * Based on tag_ksz.c. + */ + +#include +#include +#include +#include + +#include "dsa_priv.h" + +#define HELLCREEK_TAG_LEN 1 + +static struct sk_buff *hellcreek_xmit(struct sk_buff *skb, + struct net_device *dev) +{ + struct dsa_port *dp = dsa_slave_to_port(dev); + struct sk_buff *nskb; + int padlen; + u8 *tag; + + padlen = (skb->len >= ETH_ZLEN) ? 0 : ETH_ZLEN - skb->len; + + if (skb_tailroom(skb) >= padlen + HELLCREEK_TAG_LEN) { + /* Let dsa_slave_xmit() free skb */ + if (__skb_put_padto(skb, skb->len + padlen, false)) + return NULL; + + nskb = skb; + } else { + nskb = alloc_skb(NET_IP_ALIGN + skb->len + + padlen + HELLCREEK_TAG_LEN, GFP_ATOMIC); + if (!nskb) + return NULL; + skb_reserve(nskb, NET_IP_ALIGN); + + skb_reset_mac_header(nskb); + skb_set_network_header(nskb, + skb_network_header(skb) - skb->head); + skb_set_transport_header(nskb, + skb_transport_header(skb) - skb->head); + skb_copy_and_csum_dev(skb, skb_put(nskb, skb->len)); + + /* Let skb_put_padto() free nskb, and let dsa_slave_xmit() free + * skb + */ + if (skb_put_padto(nskb, nskb->len + padlen)) + return NULL; + + consume_skb(skb); + } + + if (!nskb) + return NULL; + + /* Tag encoding */ + tag = skb_put(nskb, HELLCREEK_TAG_LEN); + *tag = BIT(dp->index); + + return nskb; +} + +static struct sk_buff *hellcreek_rcv(struct sk_buff *skb, + struct net_device *dev, + struct packet_type *pt) +{ + /* Tag decoding */ + u8 *tag = skb_tail_pointer(skb) - HELLCREEK_TAG_LEN; + unsigned int port = tag[0] & 0x03; + + skb->dev = dsa_master_find_slave(dev, 0, port); + if (!skb->dev) { + netdev_warn(dev, "Failed to get source port: %d\n", port); + return NULL; + } + + pskb_trim_rcsum(skb, skb->len - HELLCREEK_TAG_LEN); + + skb->offload_fwd_mark = true; + + return skb; +} + +static const struct dsa_device_ops hellcreek_netdev_ops = { + .name = "hellcreek", + .proto = DSA_TAG_PROTO_HELLCREEK, + .xmit = hellcreek_xmit, + .rcv = hellcreek_rcv, + .overhead = HELLCREEK_TAG_LEN, + .tail_tag = true, +}; + +MODULE_LICENSE("Dual MIT/GPL"); +MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_HELLCREEK); + +module_dsa_tag_driver(hellcreek_netdev_ops);