// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2019 Pengutronix, Oleksij Rempel <kernel@pengutronix.de>
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*/
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#include <linux/bitfield.h>
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#include <linux/etherdevice.h>
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#include "dsa_priv.h"
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#define AR9331_HDR_LEN 2
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#define AR9331_HDR_VERSION 1
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#define AR9331_HDR_VERSION_MASK GENMASK(15, 14)
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#define AR9331_HDR_PRIORITY_MASK GENMASK(13, 12)
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#define AR9331_HDR_TYPE_MASK GENMASK(10, 8)
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#define AR9331_HDR_BROADCAST BIT(7)
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#define AR9331_HDR_FROM_CPU BIT(6)
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/* AR9331_HDR_RESERVED - not used or may be version field.
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* According to the AR8216 doc it should 0b10. On AR9331 it is 0b11 on RX path
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* and should be set to 0b11 to make it work.
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*/
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#define AR9331_HDR_RESERVED_MASK GENMASK(5, 4)
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#define AR9331_HDR_PORT_NUM_MASK GENMASK(3, 0)
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static struct sk_buff *ar9331_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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__le16 *phdr;
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u16 hdr;
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phdr = skb_push(skb, AR9331_HDR_LEN);
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hdr = FIELD_PREP(AR9331_HDR_VERSION_MASK, AR9331_HDR_VERSION);
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hdr |= AR9331_HDR_FROM_CPU | dp->index;
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/* 0b10 for AR8216 and 0b11 for AR9331 */
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hdr |= AR9331_HDR_RESERVED_MASK;
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phdr[0] = cpu_to_le16(hdr);
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return skb;
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}
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static struct sk_buff *ar9331_tag_rcv(struct sk_buff *skb,
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struct net_device *ndev,
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struct packet_type *pt)
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{
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u8 ver, port;
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u16 hdr;
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if (unlikely(!pskb_may_pull(skb, AR9331_HDR_LEN)))
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return NULL;
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hdr = le16_to_cpu(*(__le16 *)skb_mac_header(skb));
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ver = FIELD_GET(AR9331_HDR_VERSION_MASK, hdr);
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if (unlikely(ver != AR9331_HDR_VERSION)) {
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netdev_warn_once(ndev, "%s:%i wrong header version 0x%2x\n",
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__func__, __LINE__, hdr);
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return NULL;
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}
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if (unlikely(hdr & AR9331_HDR_FROM_CPU)) {
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netdev_warn_once(ndev, "%s:%i packet should not be from cpu 0x%2x\n",
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__func__, __LINE__, hdr);
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return NULL;
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}
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skb_pull_rcsum(skb, AR9331_HDR_LEN);
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/* Get source port information */
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port = FIELD_GET(AR9331_HDR_PORT_NUM_MASK, hdr);
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skb->dev = dsa_master_find_slave(ndev, 0, port);
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if (!skb->dev)
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return NULL;
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return skb;
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}
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static const struct dsa_device_ops ar9331_netdev_ops = {
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.name = "ar9331",
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.proto = DSA_TAG_PROTO_AR9331,
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.xmit = ar9331_tag_xmit,
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.rcv = ar9331_tag_rcv,
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.overhead = AR9331_HDR_LEN,
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};
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_AR9331);
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module_dsa_tag_driver(ar9331_netdev_ops);
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