From patchwork Mon Mar 13 16:11:26 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sean Wang X-Patchwork-Id: 9621373 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id B769A60244 for ; Mon, 13 Mar 2017 16:12:36 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A6EEA283F3 for ; Mon, 13 Mar 2017 16:12:36 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 9BD652842C; Mon, 13 Mar 2017 16:12:36 +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=-1.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,UNPARSEABLE_RELAY autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id E75B0283F3 for ; Mon, 13 Mar 2017 16:12:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=cWY8ZWWGU1/2YPGpcOJQVqyrqspKjzkmOuj7PyjM8YM=; b=nLSLsLmhg+5Ya/ RLotTCC+3BIcYpf1hSlRQ7QJ1M7fTMXij96zOvYMAdOOSCLxaitl2HBAhCcTlDuDT4LXdZSIpnMCL hRICE4SSGwDi3p6dqNU4vMd6QBlhcjc0LPT8sweOwD2bI0LWBnQD4rNFnBXUWDthpuMLnaqwwHWS7 DoIyF5AyDNP5nuWx1voD0Bj3jHf/8JQBea8sbdg2Nu0Qu32AYn8fcSeB36zaXKbeyPi5F8KzQxVDU m3oiW0qV+bL7eLQxbHc+mu5RJNhlVnNU5Os0MpusWPFqxCW5UOCn/AWuyCk42YMhi0cO4OylzlKOF Mf1Ktgrgcl6UhuQ+iu5g==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1cnSaJ-0000do-7W; Mon, 13 Mar 2017 16:12:35 +0000 Received: from [210.61.82.184] (helo=mailgw02.mediatek.com) by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1cnSaE-0000Ih-Uq for linux-mediatek@lists.infradead.org; Mon, 13 Mar 2017 16:12:33 +0000 Received: from mtkhts07.mediatek.inc [(172.21.101.69)] by mailgw02.mediatek.com (envelope-from ) (mhqrelay.mediatek.com ESMTP with TLS) with ESMTP id 1237455298; Tue, 14 Mar 2017 00:12:05 +0800 Received: from mtkswgap22.mediatek.inc (172.21.77.33) by mtkhts07.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 14.3.266.1; Tue, 14 Mar 2017 00:12:03 +0800 From: To: , , , , , Subject: [PATCH net-next 2/4] net-next: dsa: add Mediatek tag RX/TX handler Date: Tue, 14 Mar 2017 00:11:26 +0800 Message-ID: <1489421488-300-3-git-send-email-sean.wang@mediatek.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1489421488-300-1-git-send-email-sean.wang@mediatek.com> References: <1489421488-300-1-git-send-email-sean.wang@mediatek.com> MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20170313_091231_343309_B33F42DB X-CRM114-Status: GOOD ( 21.37 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, Landen.Chao@mediatek.com, keyhaede@gmail.com, netdev@vger.kernel.org, sean.wang@mediatek.com, linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org, objelf@gmail.com, davem@davemloft.net Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+patchwork-linux-mediatek=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP From: Sean Wang Add the support for the 4-bytes tag for DSA port distinguishing inserted allowing receiving and transmitting the packet via the particular port. The tag is being added after the source MAC address in the ethernet header. Signed-off-by: Sean Wang Signed-off-by: Landen Chao Reviewed-by: Andrew Lunn Reviewed-by: Florian Fainelli --- include/net/dsa.h | 1 + net/dsa/Kconfig | 2 + net/dsa/Makefile | 1 + net/dsa/dsa.c | 3 ++ net/dsa/dsa_priv.h | 3 ++ net/dsa/tag_mtk.c | 121 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 6 files changed, 131 insertions(+) create mode 100644 net/dsa/tag_mtk.c diff --git a/include/net/dsa.h b/include/net/dsa.h index b122196..954cff2 100644 --- a/include/net/dsa.h +++ b/include/net/dsa.h @@ -27,6 +27,7 @@ enum dsa_tag_protocol { DSA_TAG_PROTO_EDSA, DSA_TAG_PROTO_BRCM, DSA_TAG_PROTO_QCA, + DSA_TAG_PROTO_MTK, DSA_TAG_LAST, /* MUST BE LAST */ }; diff --git a/net/dsa/Kconfig b/net/dsa/Kconfig index 96e47c5..43b67e8 100644 --- a/net/dsa/Kconfig +++ b/net/dsa/Kconfig @@ -41,4 +41,6 @@ config NET_DSA_TAG_TRAILER config NET_DSA_TAG_QCA bool +config NET_DSA_TAG_MTK + bool endif diff --git a/net/dsa/Makefile b/net/dsa/Makefile index a3380ed..97c9891 100644 --- a/net/dsa/Makefile +++ b/net/dsa/Makefile @@ -8,3 +8,4 @@ dsa_core-$(CONFIG_NET_DSA_TAG_DSA) += tag_dsa.o dsa_core-$(CONFIG_NET_DSA_TAG_EDSA) += tag_edsa.o dsa_core-$(CONFIG_NET_DSA_TAG_TRAILER) += tag_trailer.o dsa_core-$(CONFIG_NET_DSA_TAG_QCA) += tag_qca.o +dsa_core-$(CONFIG_NET_DSA_TAG_MTK) += tag_mtk.o diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c index 7899919..3586b1e 100644 --- a/net/dsa/dsa.c +++ b/net/dsa/dsa.c @@ -57,6 +57,9 @@ static struct sk_buff *dsa_slave_notag_xmit(struct sk_buff *skb, #ifdef CONFIG_NET_DSA_TAG_QCA [DSA_TAG_PROTO_QCA] = &qca_netdev_ops, #endif +#ifdef CONFIG_NET_DSA_TAG_MTK + [DSA_TAG_PROTO_MTK] = &mtk_dsa_netdev_ops, +#endif [DSA_TAG_PROTO_NONE] = &none_ops, }; diff --git a/net/dsa/dsa_priv.h b/net/dsa/dsa_priv.h index 6cfd738..de61e8f 100644 --- a/net/dsa/dsa_priv.h +++ b/net/dsa/dsa_priv.h @@ -84,4 +84,7 @@ int dsa_slave_netdevice_event(struct notifier_block *unused, /* tag_qca.c */ extern const struct dsa_device_ops qca_netdev_ops; +/* tag_mtk.c */ +extern const struct dsa_device_ops mtk_dsa_netdev_ops; + #endif diff --git a/net/dsa/tag_mtk.c b/net/dsa/tag_mtk.c new file mode 100644 index 0000000..a2dc014 --- /dev/null +++ b/net/dsa/tag_mtk.c @@ -0,0 +1,121 @@ +/* + * Mediatek DSA Tag support + * Copyright (C) 2017 Landen Chao + * Sean Wang + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include +#include "dsa_priv.h" + +#define MTK_HDR_LEN 4 +#define MTK_HDR_RECV_SOURCE_PORT_MASK GENMASK(2, 0) +#define MTK_HDR_XMIT_DP_BIT_MASK GENMASK(5, 0) + +static struct sk_buff *mtk_tag_xmit(struct sk_buff *skb, + struct net_device *dev) +{ + struct dsa_slave_priv *p = netdev_priv(dev); + u8 *mtk_tag; + + if (skb_cow_head(skb, MTK_HDR_LEN) < 0) + goto out_free; + + skb_push(skb, MTK_HDR_LEN); + + memmove(skb->data, skb->data + MTK_HDR_LEN, 2 * ETH_ALEN); + + /* Build the tag after the MAC Source Address */ + mtk_tag = skb->data + 2 * ETH_ALEN; + + /* Set the ingress opcode, traffic class, tag enforcment is + * deprecated + */ + mtk_tag[0] = 0; + mtk_tag[1] = (1 << p->port) & MTK_HDR_XMIT_DP_BIT_MASK; + mtk_tag[2] = 0; + mtk_tag[3] = 0; + + return skb; + +out_free: + kfree_skb(skb); + return NULL; +} + +static int mtk_tag_rcv(struct sk_buff *skb, struct net_device *dev, + struct packet_type *pt, struct net_device *orig_dev) +{ + struct dsa_switch_tree *dst = dev->dsa_ptr; + struct dsa_switch *ds; + int port; + __be16 *phdr, hdr; + + if (unlikely(!dst)) + goto out_drop; + + skb = skb_unshare(skb, GFP_ATOMIC); + if (!skb) + goto out; + + if (unlikely(!pskb_may_pull(skb, MTK_HDR_LEN))) + goto out_drop; + + /* The MTK header is added by the switch between src addr + * and ethertype at this point, skb->data points to 2bytes + * after src addr so header should be 2 bytes right before. + */ + phdr = (__be16 *)(skb->data - 2); + hdr = ntohs(*phdr); + + /* Remove MTK tag and recalculate checksum. */ + skb_pull_rcsum(skb, MTK_HDR_LEN); + + memmove(skb->data - ETH_HLEN, + skb->data - ETH_HLEN - MTK_HDR_LEN, + 2 * ETH_ALEN); + + /* This protocol doesn't support cascading multiple + * switches so it's safe to assume the switch is first + * in the tree. + */ + ds = dst->ds[0]; + if (!ds) + goto out_drop; + + /* Get source port information */ + port = (hdr & MTK_HDR_RECV_SOURCE_PORT_MASK); + if (!ds->ports[port].netdev) + goto out_drop; + + /* Update skb & forward the frame accordingly */ + skb_push(skb, ETH_HLEN); + + skb->pkt_type = PACKET_HOST; + skb->dev = ds->ports[port].netdev; + skb->protocol = eth_type_trans(skb, skb->dev); + + skb->dev->stats.rx_packets++; + skb->dev->stats.rx_bytes += skb->len; + + netif_receive_skb(skb); + + return 0; + +out_drop: + kfree_skb(skb); +out: + return 0; +} + +const struct dsa_device_ops mtk_dsa_netdev_ops = { + .xmit = mtk_tag_xmit, + .rcv = mtk_tag_rcv, +};