// SPDX-License-Identifier: GPL-2.0
/*
 * Driver for Marvell PPv2 network controller for Armada 375 SoC.
 *
 * Copyright (C) 2018 Marvell
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/debugfs.h>

#include "mvpp2.h"
#include "mvpp2_prs.h"

struct mvpp2_dbgfs_prs_entry {
	int tid;
	struct mvpp2 *priv;
};

static int mvpp2_dbgfs_port_vid_show(struct seq_file *s, void *unused)
{
	struct mvpp2_port *port = s->private;
	unsigned char byte[2], enable[2];
	struct mvpp2 *priv = port->priv;
	struct mvpp2_prs_entry pe;
	unsigned long pmap;
	u16 rvid;
	int tid;

	for (tid = MVPP2_PRS_VID_PORT_FIRST(port->id);
	     tid <= MVPP2_PRS_VID_PORT_LAST(port->id); tid++) {
		mvpp2_prs_init_from_hw(priv, &pe, tid);

		pmap = mvpp2_prs_tcam_port_map_get(&pe);

		if (!priv->prs_shadow[tid].valid)
			continue;

		if (!test_bit(port->id, &pmap))
			continue;

		mvpp2_prs_tcam_data_byte_get(&pe, 2, &byte[0], &enable[0]);
		mvpp2_prs_tcam_data_byte_get(&pe, 3, &byte[1], &enable[1]);

		rvid = ((byte[0] & 0xf) << 8) + byte[1];

		seq_printf(s, "%u\n", rvid);
	}

	return 0;
}

DEFINE_SHOW_ATTRIBUTE(mvpp2_dbgfs_port_vid);

static int mvpp2_dbgfs_port_parser_show(struct seq_file *s, void *unused)
{
	struct mvpp2_port *port = s->private;
	struct mvpp2 *priv = port->priv;
	struct mvpp2_prs_entry pe;
	unsigned long pmap;
	int i;

	for (i = 0; i < MVPP2_PRS_TCAM_SRAM_SIZE; i++) {
		mvpp2_prs_init_from_hw(port->priv, &pe, i);

		pmap = mvpp2_prs_tcam_port_map_get(&pe);
		if (priv->prs_shadow[i].valid && test_bit(port->id, &pmap))
			seq_printf(s, "%03d\n", i);
	}

	return 0;
}

DEFINE_SHOW_ATTRIBUTE(mvpp2_dbgfs_port_parser);

static int mvpp2_dbgfs_filter_show(struct seq_file *s, void *unused)
{
	struct mvpp2_port *port = s->private;
	struct mvpp2 *priv = port->priv;
	struct mvpp2_prs_entry pe;
	unsigned long pmap;
	int index, tid;

	for (tid = MVPP2_PE_MAC_RANGE_START;
	     tid <= MVPP2_PE_MAC_RANGE_END; tid++) {
		unsigned char da[ETH_ALEN], da_mask[ETH_ALEN];

		if (!priv->prs_shadow[tid].valid ||
		    priv->prs_shadow[tid].lu != MVPP2_PRS_LU_MAC ||
		    priv->prs_shadow[tid].udf != MVPP2_PRS_UDF_MAC_DEF)
			continue;

		mvpp2_prs_init_from_hw(priv, &pe, tid);

		pmap = mvpp2_prs_tcam_port_map_get(&pe);

		/* We only want entries active on this port */
		if (!test_bit(port->id, &pmap))
			continue;

		/* Read mac addr from entry */
		for (index = 0; index < ETH_ALEN; index++)
			mvpp2_prs_tcam_data_byte_get(&pe, index, &da[index],
						     &da_mask[index]);

		seq_printf(s, "%pM\n", da);
	}

	return 0;
}

DEFINE_SHOW_ATTRIBUTE(mvpp2_dbgfs_filter);

static int mvpp2_dbgfs_prs_lu_show(struct seq_file *s, void *unused)
{
	struct mvpp2_dbgfs_prs_entry *entry = s->private;
	struct mvpp2 *priv = entry->priv;

	seq_printf(s, "%x\n", priv->prs_shadow[entry->tid].lu);

	return 0;
}

DEFINE_SHOW_ATTRIBUTE(mvpp2_dbgfs_prs_lu);

static int mvpp2_dbgfs_prs_pmap_show(struct seq_file *s, void *unused)
{
	struct mvpp2_dbgfs_prs_entry *entry = s->private;
	struct mvpp2_prs_entry pe;
	unsigned int pmap;

	mvpp2_prs_init_from_hw(entry->priv, &pe, entry->tid);

	pmap = mvpp2_prs_tcam_port_map_get(&pe);
	pmap &= MVPP2_PRS_PORT_MASK;

	seq_printf(s, "%02x\n", pmap);

	return 0;
}

DEFINE_SHOW_ATTRIBUTE(mvpp2_dbgfs_prs_pmap);

static int mvpp2_dbgfs_prs_ai_show(struct seq_file *s, void *unused)
{
	struct mvpp2_dbgfs_prs_entry *entry = s->private;
	struct mvpp2_prs_entry pe;
	unsigned char ai, ai_mask;

	mvpp2_prs_init_from_hw(entry->priv, &pe, entry->tid);

	ai = pe.tcam[MVPP2_PRS_TCAM_AI_WORD] & MVPP2_PRS_AI_MASK;
	ai_mask = (pe.tcam[MVPP2_PRS_TCAM_AI_WORD] >> 16) & MVPP2_PRS_AI_MASK;

	seq_printf(s, "%02x %02x\n", ai, ai_mask);

	return 0;
}

DEFINE_SHOW_ATTRIBUTE(mvpp2_dbgfs_prs_ai);

static int mvpp2_dbgfs_prs_hdata_show(struct seq_file *s, void *unused)
{
	struct mvpp2_dbgfs_prs_entry *entry = s->private;
	struct mvpp2_prs_entry pe;
	unsigned char data[8], mask[8];
	int i;

	mvpp2_prs_init_from_hw(entry->priv, &pe, entry->tid);

	for (i = 0; i < 8; i++)
		mvpp2_prs_tcam_data_byte_get(&pe, i, &data[i], &mask[i]);

	seq_printf(s, "%*phN %*phN\n", 8, data, 8, mask);

	return 0;
}

DEFINE_SHOW_ATTRIBUTE(mvpp2_dbgfs_prs_hdata);

static int mvpp2_dbgfs_prs_sram_show(struct seq_file *s, void *unused)
{
	struct mvpp2_dbgfs_prs_entry *entry = s->private;
	struct mvpp2_prs_entry pe;

	mvpp2_prs_init_from_hw(entry->priv, &pe, entry->tid);

	seq_printf(s, "%*phN\n", 14, pe.sram);

	return 0;
}

DEFINE_SHOW_ATTRIBUTE(mvpp2_dbgfs_prs_sram);

static int mvpp2_dbgfs_prs_valid_show(struct seq_file *s, void *unused)
{
	struct mvpp2_dbgfs_prs_entry *entry = s->private;
	struct mvpp2 *priv = entry->priv;
	int tid = entry->tid;

	seq_printf(s, "%d\n", priv->prs_shadow[tid].valid ? 1 : 0);

	return 0;
}

static int mvpp2_dbgfs_prs_valid_open(struct inode *inode, struct file *file)
{
	return single_open(file, mvpp2_dbgfs_prs_valid_show, inode->i_private);
}

static int mvpp2_dbgfs_prs_valid_release(struct inode *inode, struct file *file)
{
	struct seq_file *seq = file->private_data;
	struct mvpp2_dbgfs_prs_entry *entry = seq->private;

	kfree(entry);
	return single_release(inode, file);
}

static const struct file_operations mvpp2_dbgfs_prs_valid_fops = {
	.open = mvpp2_dbgfs_prs_valid_open,
	.read = seq_read,
	.release = mvpp2_dbgfs_prs_valid_release,
};

static int mvpp2_dbgfs_prs_entry_init(struct dentry *parent,
				      struct mvpp2 *priv, int tid)
{
	struct mvpp2_dbgfs_prs_entry *entry;
	struct dentry *prs_entry_dir;
	char prs_entry_name[10];

	if (tid >= MVPP2_PRS_TCAM_SRAM_SIZE)
		return -EINVAL;

	sprintf(prs_entry_name, "%03d", tid);

	prs_entry_dir = debugfs_create_dir(prs_entry_name, parent);
	if (!prs_entry_dir)
		return -ENOMEM;

	/* The 'valid' entry's ops will free that */
	entry = kmalloc(sizeof(*entry), GFP_KERNEL);
	if (!entry)
		return -ENOMEM;

	entry->tid = tid;
	entry->priv = priv;

	/* Create each attr */
	debugfs_create_file("sram", 0444, prs_entry_dir, entry,
			    &mvpp2_dbgfs_prs_sram_fops);

	debugfs_create_file("valid", 0644, prs_entry_dir, entry,
			    &mvpp2_dbgfs_prs_valid_fops);

	debugfs_create_file("lookup_id", 0644, prs_entry_dir, entry,
			    &mvpp2_dbgfs_prs_lu_fops);

	debugfs_create_file("ai", 0644, prs_entry_dir, entry,
			    &mvpp2_dbgfs_prs_ai_fops);

	debugfs_create_file("header_data", 0644, prs_entry_dir, entry,
			    &mvpp2_dbgfs_prs_hdata_fops);

	return 0;
}

static int mvpp2_dbgfs_prs_init(struct dentry *parent, struct mvpp2 *priv)
{
	struct dentry *prs_dir;
	int i, ret;

	prs_dir = debugfs_create_dir("parser", parent);
	if (!prs_dir)
		return -ENOMEM;

	for (i = 0; i < MVPP2_PRS_TCAM_SRAM_SIZE; i++) {
		ret = mvpp2_dbgfs_prs_entry_init(prs_dir, priv, i);
		if (ret)
			return ret;
	}

	return 0;
}

static int mvpp2_dbgfs_port_init(struct dentry *parent,
				 struct mvpp2_port *port)
{
	struct dentry *port_dir;

	port_dir = debugfs_create_dir(port->dev->name, parent);
	if (IS_ERR(port_dir))
		return PTR_ERR(port_dir);

	debugfs_create_file("parser_entries", 0444, port_dir, port,
			    &mvpp2_dbgfs_port_parser_fops);

	debugfs_create_file("mac_filter", 0444, port_dir, port,
			    &mvpp2_dbgfs_filter_fops);

	debugfs_create_file("vid_filter", 0444, port_dir, port,
			    &mvpp2_dbgfs_port_vid_fops);

	return 0;
}

void mvpp2_dbgfs_cleanup(struct mvpp2 *priv)
{
	debugfs_remove_recursive(priv->dbgfs_dir);
}

void mvpp2_dbgfs_init(struct mvpp2 *priv, const char *name)
{
	struct dentry *mvpp2_dir, *mvpp2_root;
	int ret, i;

	mvpp2_root = debugfs_lookup(MVPP2_DRIVER_NAME, NULL);
	if (!mvpp2_root) {
		mvpp2_root = debugfs_create_dir(MVPP2_DRIVER_NAME, NULL);
		if (IS_ERR(mvpp2_root))
			return;
	}

	mvpp2_dir = debugfs_create_dir(name, mvpp2_root);
	if (IS_ERR(mvpp2_dir))
		return;

	priv->dbgfs_dir = mvpp2_dir;

	ret = mvpp2_dbgfs_prs_init(mvpp2_dir, priv);
	if (ret)
		goto err;

	for (i = 0; i < priv->port_count; i++) {
		ret = mvpp2_dbgfs_port_init(mvpp2_dir, priv->port_list[i]);
		if (ret)
			goto err;
	}

	return;
err:
	mvpp2_dbgfs_cleanup(priv);
}