// SPDX-License-Identifier: GPL-2.0-only
/*
 * debugfs code for HSR & PRP
 * Copyright (C) 2019 Texas Instruments Incorporated
 *
 * Author(s):
 *      Murali Karicheri <m-karicheri2@ti.com>
 */
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/debugfs.h>
#include "hsr_main.h"
#include "hsr_framereg.h"

static struct dentry *hsr_debugfs_root_dir;

/* hsr_node_table_show - Formats and prints node_table entries */
static int
hsr_node_table_show(struct seq_file *sfp, void *data)
{
        struct hsr_priv *priv = (struct hsr_priv *)sfp->private;
        struct hsr_node *node;

        seq_printf(sfp, "Node Table entries for (%s) device\n",
                   (priv->prot_version == PRP_V1 ? "PRP" : "HSR"));
        seq_puts(sfp, "MAC-Address-A,    MAC-Address-B,    time_in[A], ");
        seq_puts(sfp, "time_in[B], Address-B port, ");
        if (priv->prot_version == PRP_V1)
                seq_puts(sfp, "SAN-A, SAN-B, DAN-P\n");
        else
                seq_puts(sfp, "DAN-H\n");

        rcu_read_lock();
        list_for_each_entry_rcu(node, &priv->node_db, mac_list) {
                /* skip self node */
                if (hsr_addr_is_self(priv, node->macaddress_A))
                        continue;
                seq_printf(sfp, "%pM ", &node->macaddress_A[0]);
                seq_printf(sfp, "%pM ", &node->macaddress_B[0]);
                seq_printf(sfp, "%10lx, ", node->time_in[HSR_PT_SLAVE_A]);
                seq_printf(sfp, "%10lx, ", node->time_in[HSR_PT_SLAVE_B]);
                seq_printf(sfp, "%14x, ", node->addr_B_port);

                if (priv->prot_version == PRP_V1)
                        seq_printf(sfp, "%5x, %5x, %5x\n",
                                   node->san_a, node->san_b,
                                   (node->san_a == 0 && node->san_b == 0));
                else
                        seq_printf(sfp, "%5x\n", 1);
        }
        rcu_read_unlock();
        return 0;
}

DEFINE_SHOW_ATTRIBUTE(hsr_node_table);

void hsr_debugfs_rename(struct net_device *dev)
{
        struct hsr_priv *priv = netdev_priv(dev);
        int err;

        err = debugfs_change_name(priv->node_tbl_root, "%s", dev->name);
        if (err)
                netdev_warn(dev, "failed to rename\n");
}

/* hsr_debugfs_init - create hsr node_table file for dumping
 * the node table
 *
 * Description:
 * When debugfs is configured this routine sets up the node_table file per
 * hsr device for dumping the node_table entries
 */
void hsr_debugfs_init(struct hsr_priv *priv, struct net_device *hsr_dev)
{
        struct dentry *de = NULL;

        de = debugfs_create_dir(hsr_dev->name, hsr_debugfs_root_dir);
        if (IS_ERR(de)) {
                pr_err("Cannot create hsr debugfs directory\n");
                return;
        }

        priv->node_tbl_root = de;

        de = debugfs_create_file("node_table", S_IFREG | 0444,
                                 priv->node_tbl_root, priv,
                                 &hsr_node_table_fops);
        if (IS_ERR(de)) {
                pr_err("Cannot create hsr node_table file\n");
                debugfs_remove(priv->node_tbl_root);
                priv->node_tbl_root = NULL;
                return;
        }
}

/* hsr_debugfs_term - Tear down debugfs intrastructure
 *
 * Description:
 * When Debugfs is configured this routine removes debugfs file system
 * elements that are specific to hsr
 */
void
hsr_debugfs_term(struct hsr_priv *priv)
{
        debugfs_remove_recursive(priv->node_tbl_root);
        priv->node_tbl_root = NULL;
}

void hsr_debugfs_create_root(void)
{
        hsr_debugfs_root_dir = debugfs_create_dir("hsr", NULL);
        if (IS_ERR(hsr_debugfs_root_dir)) {
                pr_err("Cannot create hsr debugfs root directory\n");
                hsr_debugfs_root_dir = NULL;
        }
}

void hsr_debugfs_remove_root(void)
{
        /* debugfs_remove() internally checks NULL and ERROR */
        debugfs_remove(hsr_debugfs_root_dir);
}