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Filename : ocelot.h
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/* SPDX-License-Identifier: GPL-2.0
 * Copyright 2019-2021 NXP
 */

#ifndef _NET_DSA_TAG_OCELOT_H
#define _NET_DSA_TAG_OCELOT_H

#include <linux/if_bridge.h>
#include <linux/if_vlan.h>
#include <linux/kthread.h>
#include <linux/packing.h>
#include <linux/skbuff.h>
#include <net/dsa.h>

struct ocelot_skb_cb {
	struct sk_buff *clone;
	unsigned int ptp_class; /* valid only for clones */
	unsigned long ptp_tx_time; /* valid only for clones */
	u32 tstamp_lo;
	u8 ptp_cmd;
	u8 ts_id;
};

#define OCELOT_SKB_CB(skb) \
	((struct ocelot_skb_cb *)((skb)->cb))

#define IFH_TAG_TYPE_C			0
#define IFH_TAG_TYPE_S			1

#define IFH_REW_OP_NOOP			0x0
#define IFH_REW_OP_DSCP			0x1
#define IFH_REW_OP_ONE_STEP_PTP		0x2
#define IFH_REW_OP_TWO_STEP_PTP		0x3
#define IFH_REW_OP_ORIGIN_PTP		0x5

#define OCELOT_TAG_LEN			16
#define OCELOT_SHORT_PREFIX_LEN		4
#define OCELOT_LONG_PREFIX_LEN		16
#define OCELOT_TOTAL_TAG_LEN	(OCELOT_SHORT_PREFIX_LEN + OCELOT_TAG_LEN)

/* The CPU injection header and the CPU extraction header can have 3 types of
 * prefixes: long, short and no prefix. The format of the header itself is the
 * same in all 3 cases.
 *
 * Extraction with long prefix:
 *
 * +-------------------+-------------------+------+------+------------+-------+
 * | ff:ff:ff:ff:ff:ff | fe:ff:ff:ff:ff:ff | 8880 | 000a | extraction | frame |
 * |                   |                   |      |      |   header   |       |
 * +-------------------+-------------------+------+------+------------+-------+
 *        48 bits             48 bits      16 bits 16 bits  128 bits
 *
 * Extraction with short prefix:
 *
 *                                         +------+------+------------+-------+
 *                                         | 8880 | 000a | extraction | frame |
 *                                         |      |      |   header   |       |
 *                                         +------+------+------------+-------+
 *                                         16 bits 16 bits  128 bits
 *
 * Extraction with no prefix:
 *
 *                                                       +------------+-------+
 *                                                       | extraction | frame |
 *                                                       |   header   |       |
 *                                                       +------------+-------+
 *                                                          128 bits
 *
 *
 * Injection with long prefix:
 *
 * +-------------------+-------------------+------+------+------------+-------+
 * |      any dmac     |      any smac     | 8880 | 000a | injection  | frame |
 * |                   |                   |      |      |   header   |       |
 * +-------------------+-------------------+------+------+------------+-------+
 *        48 bits             48 bits      16 bits 16 bits  128 bits
 *
 * Injection with short prefix:
 *
 *                                         +------+------+------------+-------+
 *                                         | 8880 | 000a | injection  | frame |
 *                                         |      |      |   header   |       |
 *                                         +------+------+------------+-------+
 *                                         16 bits 16 bits  128 bits
 *
 * Injection with no prefix:
 *
 *                                                       +------------+-------+
 *                                                       | injection  | frame |
 *                                                       |   header   |       |
 *                                                       +------------+-------+
 *                                                          128 bits
 *
 * The injection header looks like this (network byte order, bit 127
 * is part of lowest address byte in memory, bit 0 is part of highest
 * address byte):
 *
 *         +------+------+------+------+------+------+------+------+
 * 127:120 |BYPASS| MASQ |          MASQ_PORT        |REW_OP|REW_OP|
 *         +------+------+------+------+------+------+------+------+
 * 119:112 |                         REW_OP                        |
 *         +------+------+------+------+------+------+------+------+
 * 111:104 |                         REW_VAL                       |
 *         +------+------+------+------+------+------+------+------+
 * 103: 96 |                         REW_VAL                       |
 *         +------+------+------+------+------+------+------+------+
 *  95: 88 |                         REW_VAL                       |
 *         +------+------+------+------+------+------+------+------+
 *  87: 80 |                         REW_VAL                       |
 *         +------+------+------+------+------+------+------+------+
 *  79: 72 |                          RSV                          |
 *         +------+------+------+------+------+------+------+------+
 *  71: 64 |            RSV            |           DEST            |
 *         +------+------+------+------+------+------+------+------+
 *  63: 56 |                         DEST                          |
 *         +------+------+------+------+------+------+------+------+
 *  55: 48 |                          RSV                          |
 *         +------+------+------+------+------+------+------+------+
 *  47: 40 |  RSV |         SRC_PORT          |     RSV     |TFRM_TIMER|
 *         +------+------+------+------+------+------+------+------+
 *  39: 32 |     TFRM_TIMER     |               RSV                |
 *         +------+------+------+------+------+------+------+------+
 *  31: 24 |  RSV |  DP  |   POP_CNT   |           CPUQ            |
 *         +------+------+------+------+------+------+------+------+
 *  23: 16 |           CPUQ            |      QOS_CLASS     |TAG_TYPE|
 *         +------+------+------+------+------+------+------+------+
 *  15:  8 |         PCP        |  DEI |            VID            |
 *         +------+------+------+------+------+------+------+------+
 *   7:  0 |                          VID                          |
 *         +------+------+------+------+------+------+------+------+
 *
 * And the extraction header looks like this:
 *
 *         +------+------+------+------+------+------+------+------+
 * 127:120 |  RSV |                  REW_OP                        |
 *         +------+------+------+------+------+------+------+------+
 * 119:112 |       REW_OP       |              REW_VAL             |
 *         +------+------+------+------+------+------+------+------+
 * 111:104 |                         REW_VAL                       |
 *         +------+------+------+------+------+------+------+------+
 * 103: 96 |                         REW_VAL                       |
 *         +------+------+------+------+------+------+------+------+
 *  95: 88 |                         REW_VAL                       |
 *         +------+------+------+------+------+------+------+------+
 *  87: 80 |       REW_VAL      |               LLEN               |
 *         +------+------+------+------+------+------+------+------+
 *  79: 72 | LLEN |                      WLEN                      |
 *         +------+------+------+------+------+------+------+------+
 *  71: 64 | WLEN |                      RSV                       |
 *         +------+------+------+------+------+------+------+------+
 *  63: 56 |                          RSV                          |
 *         +------+------+------+------+------+------+------+------+
 *  55: 48 |                          RSV                          |
 *         +------+------+------+------+------+------+------+------+
 *  47: 40 | RSV  |          SRC_PORT         |       ACL_ID       |
 *         +------+------+------+------+------+------+------+------+
 *  39: 32 |       ACL_ID       |  RSV |         SFLOW_ID          |
 *         +------+------+------+------+------+------+------+------+
 *  31: 24 |ACL_HIT| DP  |  LRN_FLAGS  |           CPUQ            |
 *         +------+------+------+------+------+------+------+------+
 *  23: 16 |           CPUQ            |      QOS_CLASS     |TAG_TYPE|
 *         +------+------+------+------+------+------+------+------+
 *  15:  8 |         PCP        |  DEI |            VID            |
 *         +------+------+------+------+------+------+------+------+
 *   7:  0 |                          VID                          |
 *         +------+------+------+------+------+------+------+------+
 */

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

struct ocelot_8021q_tagger_data {
	void (*xmit_work_fn)(struct kthread_work *work);
};

static inline struct ocelot_8021q_tagger_data *
ocelot_8021q_tagger_data(struct dsa_switch *ds)
{
	BUG_ON(ds->dst->tag_ops->proto != DSA_TAG_PROTO_OCELOT_8021Q);

	return ds->tagger_data;
}

static inline void ocelot_xfh_get_rew_val(void *extraction, u64 *rew_val)
{
	packing(extraction, rew_val, 116, 85, OCELOT_TAG_LEN, UNPACK, 0);
}

static inline void ocelot_xfh_get_len(void *extraction, u64 *len)
{
	u64 llen, wlen;

	packing(extraction, &llen, 84, 79, OCELOT_TAG_LEN, UNPACK, 0);
	packing(extraction, &wlen, 78, 71, OCELOT_TAG_LEN, UNPACK, 0);

	*len = 60 * wlen + llen - 80;
}

static inline void ocelot_xfh_get_src_port(void *extraction, u64 *src_port)
{
	packing(extraction, src_port, 46, 43, OCELOT_TAG_LEN, UNPACK, 0);
}

static inline void ocelot_xfh_get_qos_class(void *extraction, u64 *qos_class)
{
	packing(extraction, qos_class, 19, 17, OCELOT_TAG_LEN, UNPACK, 0);
}

static inline void ocelot_xfh_get_tag_type(void *extraction, u64 *tag_type)
{
	packing(extraction, tag_type, 16, 16, OCELOT_TAG_LEN, UNPACK, 0);
}

static inline void ocelot_xfh_get_vlan_tci(void *extraction, u64 *vlan_tci)
{
	packing(extraction, vlan_tci, 15, 0, OCELOT_TAG_LEN, UNPACK, 0);
}

static inline void ocelot_ifh_set_bypass(void *injection, u64 bypass)
{
	packing(injection, &bypass, 127, 127, OCELOT_TAG_LEN, PACK, 0);
}

static inline void ocelot_ifh_set_rew_op(void *injection, u64 rew_op)
{
	packing(injection, &rew_op, 125, 117, OCELOT_TAG_LEN, PACK, 0);
}

static inline void ocelot_ifh_set_dest(void *injection, u64 dest)
{
	packing(injection, &dest, 67, 56, OCELOT_TAG_LEN, PACK, 0);
}

static inline void ocelot_ifh_set_qos_class(void *injection, u64 qos_class)
{
	packing(injection, &qos_class, 19, 17, OCELOT_TAG_LEN, PACK, 0);
}

static inline void seville_ifh_set_dest(void *injection, u64 dest)
{
	packing(injection, &dest, 67, 57, OCELOT_TAG_LEN, PACK, 0);
}

static inline void ocelot_ifh_set_src(void *injection, u64 src)
{
	packing(injection, &src, 46, 43, OCELOT_TAG_LEN, PACK, 0);
}

static inline void ocelot_ifh_set_tag_type(void *injection, u64 tag_type)
{
	packing(injection, &tag_type, 16, 16, OCELOT_TAG_LEN, PACK, 0);
}

static inline void ocelot_ifh_set_vlan_tci(void *injection, u64 vlan_tci)
{
	packing(injection, &vlan_tci, 15, 0, OCELOT_TAG_LEN, PACK, 0);
}

/* Determine the PTP REW_OP to use for injecting the given skb */
static inline u32 ocelot_ptp_rew_op(struct sk_buff *skb)
{
	struct sk_buff *clone = OCELOT_SKB_CB(skb)->clone;
	u8 ptp_cmd = OCELOT_SKB_CB(skb)->ptp_cmd;
	u32 rew_op = 0;

	if (ptp_cmd == IFH_REW_OP_TWO_STEP_PTP && clone) {
		rew_op = ptp_cmd;
		rew_op |= OCELOT_SKB_CB(clone)->ts_id << 3;
	} else if (ptp_cmd == IFH_REW_OP_ORIGIN_PTP) {
		rew_op = ptp_cmd;
	}

	return rew_op;
}

/**
 * ocelot_xmit_get_vlan_info: Determine VLAN_TCI and TAG_TYPE for injected frame
 * @skb: Pointer to socket buffer
 * @br: Pointer to bridge device that the port is under, if any
 * @vlan_tci:
 * @tag_type:
 *
 * If the port is under a VLAN-aware bridge, remove the VLAN header from the
 * payload and move it into the DSA tag, which will make the switch classify
 * the packet to the bridge VLAN. Otherwise, leave the classified VLAN at zero,
 * which is the pvid of standalone ports (OCELOT_STANDALONE_PVID), although not
 * of VLAN-unaware bridge ports (that would be ocelot_vlan_unaware_pvid()).
 * Anyway, VID 0 is fine because it is stripped on egress for these port modes,
 * and source address learning is not performed for packets injected from the
 * CPU anyway, so it doesn't matter that the VID is "wrong".
 */
static inline void ocelot_xmit_get_vlan_info(struct sk_buff *skb,
					     struct net_device *br,
					     u64 *vlan_tci, u64 *tag_type)
{
	struct vlan_ethhdr *hdr;
	u16 proto, tci;

	if (!br || !br_vlan_enabled(br)) {
		*vlan_tci = 0;
		*tag_type = IFH_TAG_TYPE_C;
		return;
	}

	hdr = (struct vlan_ethhdr *)skb_mac_header(skb);
	br_vlan_get_proto(br, &proto);

	if (ntohs(hdr->h_vlan_proto) == proto) {
		vlan_remove_tag(skb, &tci);
		*vlan_tci = tci;
	} else {
		rcu_read_lock();
		br_vlan_get_pvid_rcu(br, &tci);
		rcu_read_unlock();
		*vlan_tci = tci;
	}

	*tag_type = (proto != ETH_P_8021Q) ? IFH_TAG_TYPE_S : IFH_TAG_TYPE_C;
}

#endif