/* SPDX-License-Identifier: GPL-2.0
 * Copyright (c) 2019, Vladimir Oltean <[email protected]>
 */

/* Included by drivers/net/dsa/sja1105/sja1105.h and net/dsa/tag_sja1105.c */

#ifndef _NET_DSA_SJA1105_H
#define _NET_DSA_SJA1105_H

#include <linux/skbuff.h>
#include <linux/etherdevice.h>
#include <linux/dsa/8021q.h>
#include <net/dsa.h>

#define ETH_P_SJA1105                ETH_P_DSA_8021Q
#define ETH_P_SJA1105_META            0x0008
#define ETH_P_SJA1110                0xdadc

#define SJA1105_DEFAULT_VLAN            (VLAN_N_VID - 1)

/* IEEE 802.3 Annex 57A: Slow Protocols PDUs (01:80:C2:xx:xx:xx) */
#define SJA1105_LINKLOCAL_FILTER_A        0x0180C2000000ull
#define SJA1105_LINKLOCAL_FILTER_A_MASK        0xFFFFFF000000ull
/* IEEE 1588 Annex F: Transport of PTP over Ethernet (01:1B:19:xx:xx:xx) */
#define SJA1105_LINKLOCAL_FILTER_B        0x011B19000000ull
#define SJA1105_LINKLOCAL_FILTER_B_MASK        0xFFFFFF000000ull

/* Source and Destination MAC of follow-up meta frames.
 * Whereas the choice of SMAC only affects the unique identification of the
 * switch as sender of meta frames, the DMAC must be an address that is present
 * in the DSA master port's multicast MAC filter.
 * 01-80-C2-00-00-0E is a good choice for this, as all profiles of IEEE 1588
 * over L2 use this address for some purpose already.
 */
#define SJA1105_META_SMAC            0x222222222222ull
#define SJA1105_META_DMAC            0x0180C200000Eull

enum sja1110_meta_tstamp {
    SJA1110_META_TSTAMP_TX = 0,
    SJA1110_META_TSTAMP_RX = 1,
};

struct sja1105_deferred_xmit_work {
    struct dsa_port *dp;
    struct sk_buff *skb;
    struct kthread_work work;
};

/* Global tagger data */
struct sja1105_tagger_data {
    void (*xmit_work_fn)(struct kthread_work *work);
    void (*meta_tstamp_handler)(struct dsa_switch *ds, int port, u8 ts_id,
                    enum sja1110_meta_tstamp dir, u64 tstamp);
} __no_const;

struct sja1105_skb_cb {
    struct sk_buff *clone;
    u64 tstamp;
    /* Only valid for packets cloned for 2-step TX timestamping */
    u8 ts_id;
};

#define SJA1105_SKB_CB(skb) \
    ((struct sja1105_skb_cb *)((skb)->cb))

static inline struct sja1105_tagger_data *
sja1105_tagger_data(struct dsa_switch *ds)
{
    BUG_ON(ds->dst->tag_ops->proto != DSA_TAG_PROTO_SJA1105 &&
           ds->dst->tag_ops->proto != DSA_TAG_PROTO_SJA1110);

    return ds->tagger_data;
}

#endif /* _NET_DSA_SJA1105_H */