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bd954b8260
It would be nice if tagging protocol drivers could include just the header they need, since they are (mostly) data path and isolated from most of the other DSA core code does. Create a tag.c and a tag.h file which are meant to support tagging protocol drivers. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
109 lines
2.6 KiB
C
109 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Mediatek DSA Tag support
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* Copyright (C) 2017 Landen Chao <landen.chao@mediatek.com>
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* Sean Wang <sean.wang@mediatek.com>
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*/
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#include <linux/etherdevice.h>
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#include <linux/if_vlan.h>
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#include "tag.h"
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#define MTK_NAME "mtk"
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#define MTK_HDR_LEN 4
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#define MTK_HDR_XMIT_UNTAGGED 0
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#define MTK_HDR_XMIT_TAGGED_TPID_8100 1
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#define MTK_HDR_XMIT_TAGGED_TPID_88A8 2
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#define MTK_HDR_RECV_SOURCE_PORT_MASK GENMASK(2, 0)
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#define MTK_HDR_XMIT_DP_BIT_MASK GENMASK(5, 0)
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#define MTK_HDR_XMIT_SA_DIS BIT(6)
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static struct sk_buff *mtk_tag_xmit(struct sk_buff *skb,
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struct net_device *dev)
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{
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struct dsa_port *dp = dsa_slave_to_port(dev);
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u8 xmit_tpid;
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u8 *mtk_tag;
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skb_set_queue_mapping(skb, dp->index);
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/* Build the special tag after the MAC Source Address. If VLAN header
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* is present, it's required that VLAN header and special tag is
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* being combined. Only in this way we can allow the switch can parse
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* the both special and VLAN tag at the same time and then look up VLAN
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* table with VID.
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*/
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switch (skb->protocol) {
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case htons(ETH_P_8021Q):
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xmit_tpid = MTK_HDR_XMIT_TAGGED_TPID_8100;
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break;
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case htons(ETH_P_8021AD):
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xmit_tpid = MTK_HDR_XMIT_TAGGED_TPID_88A8;
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break;
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default:
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xmit_tpid = MTK_HDR_XMIT_UNTAGGED;
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skb_push(skb, MTK_HDR_LEN);
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dsa_alloc_etype_header(skb, MTK_HDR_LEN);
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}
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mtk_tag = dsa_etype_header_pos_tx(skb);
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/* Mark tag attribute on special tag insertion to notify hardware
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* whether that's a combined special tag with 802.1Q header.
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*/
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mtk_tag[0] = xmit_tpid;
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mtk_tag[1] = (1 << dp->index) & MTK_HDR_XMIT_DP_BIT_MASK;
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/* Tag control information is kept for 802.1Q */
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if (xmit_tpid == MTK_HDR_XMIT_UNTAGGED) {
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mtk_tag[2] = 0;
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mtk_tag[3] = 0;
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}
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return skb;
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}
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static struct sk_buff *mtk_tag_rcv(struct sk_buff *skb, struct net_device *dev)
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{
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u16 hdr;
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int port;
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__be16 *phdr;
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if (unlikely(!pskb_may_pull(skb, MTK_HDR_LEN)))
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return NULL;
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phdr = dsa_etype_header_pos_rx(skb);
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hdr = ntohs(*phdr);
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/* Remove MTK tag and recalculate checksum. */
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skb_pull_rcsum(skb, MTK_HDR_LEN);
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dsa_strip_etype_header(skb, MTK_HDR_LEN);
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/* Get source port information */
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port = (hdr & MTK_HDR_RECV_SOURCE_PORT_MASK);
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skb->dev = dsa_master_find_slave(dev, 0, port);
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if (!skb->dev)
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return NULL;
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dsa_default_offload_fwd_mark(skb);
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return skb;
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}
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static const struct dsa_device_ops mtk_netdev_ops = {
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.name = MTK_NAME,
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.proto = DSA_TAG_PROTO_MTK,
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.xmit = mtk_tag_xmit,
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.rcv = mtk_tag_rcv,
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.needed_headroom = MTK_HDR_LEN,
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};
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_MTK, MTK_NAME);
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module_dsa_tag_driver(mtk_netdev_ops);
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