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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/net/hsr/hsr_debugfs.c
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// SPDX-License-Identifier: GPL-2.0-only

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/*

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 * debugfs code for HSR & PRP

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 * Copyright (C) 2019 Texas Instruments Incorporated

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 *

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 * Author(s):

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 *	Murali Karicheri <[email protected]>

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 */

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#include <linux/module.h>

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#include <linux/errno.h>

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#include <linux/debugfs.h>

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#include "hsr_main.h"

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#include "hsr_framereg.h"

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static struct dentry *hsr_debugfs_root_dir;

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/* hsr_node_table_show - Formats and prints node_table entries */

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static int

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hsr_node_table_show(struct seq_file *sfp, void *data)

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{

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	struct hsr_priv *priv = (struct hsr_priv *)sfp->private;

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	struct hsr_node *node;

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	seq_printf(sfp, "Node Table entries for (%s) device\n",

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		   (priv->prot_version == PRP_V1 ? "PRP" : "HSR"));

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	seq_puts(sfp, "MAC-Address-A,    MAC-Address-B,    time_in[A], ");

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	seq_puts(sfp, "time_in[B], Address-B port, ");

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	if (priv->prot_version == PRP_V1)

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		seq_puts(sfp, "SAN-A, SAN-B, DAN-P\n");

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	else

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		seq_puts(sfp, "DAN-H\n");

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	rcu_read_lock();

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	list_for_each_entry_rcu(node, &priv->node_db, mac_list) {

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		/* skip self node */

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		if (hsr_addr_is_self(priv, node->macaddress_A))

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			continue;

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		seq_printf(sfp, "%pM ", &node->macaddress_A[0]);

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		seq_printf(sfp, "%pM ", &node->macaddress_B[0]);

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		seq_printf(sfp, "%10lx, ", node->time_in[HSR_PT_SLAVE_A]);

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		seq_printf(sfp, "%10lx, ", node->time_in[HSR_PT_SLAVE_B]);

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		seq_printf(sfp, "%14x, ", node->addr_B_port);

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		if (priv->prot_version == PRP_V1)

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			seq_printf(sfp, "%5x, %5x, %5x\n",

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				   node->san_a, node->san_b,

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				   (node->san_a == 0 && node->san_b == 0));

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		else

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			seq_printf(sfp, "%5x\n", 1);

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	}

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	rcu_read_unlock();

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	return 0;

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}

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DEFINE_SHOW_ATTRIBUTE(hsr_node_table);

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void hsr_debugfs_rename(struct net_device *dev)

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{

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	struct hsr_priv *priv = netdev_priv(dev);

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	int err;

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	err = debugfs_change_name(priv->node_tbl_root, "%s", dev->name);

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	if (err)

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		netdev_warn(dev, "failed to rename\n");

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}

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/* hsr_debugfs_init - create hsr node_table file for dumping

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 * the node table

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 *

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 * Description:

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 * When debugfs is configured this routine sets up the node_table file per

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 * hsr device for dumping the node_table entries

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 */

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void hsr_debugfs_init(struct hsr_priv *priv, struct net_device *hsr_dev)

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{

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	struct dentry *de = NULL;

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	de = debugfs_create_dir(hsr_dev->name, hsr_debugfs_root_dir);

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	if (IS_ERR(de)) {

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		pr_err("Cannot create hsr debugfs directory\n");

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		return;

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	}

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	priv->node_tbl_root = de;

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	de = debugfs_create_file("node_table", S_IFREG | 0444,

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				 priv->node_tbl_root, priv,

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				 &hsr_node_table_fops);

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	if (IS_ERR(de)) {

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		pr_err("Cannot create hsr node_table file\n");

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		debugfs_remove(priv->node_tbl_root);

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		priv->node_tbl_root = NULL;

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		return;

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	}

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}

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/* hsr_debugfs_term - Tear down debugfs intrastructure

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 *

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 * Description:

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 * When Debugfs is configured this routine removes debugfs file system

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 * elements that are specific to hsr

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 */

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void

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hsr_debugfs_term(struct hsr_priv *priv)

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{

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	debugfs_remove_recursive(priv->node_tbl_root);

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	priv->node_tbl_root = NULL;

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}

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void hsr_debugfs_create_root(void)

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{

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	hsr_debugfs_root_dir = debugfs_create_dir("hsr", NULL);

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	if (IS_ERR(hsr_debugfs_root_dir)) {

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		pr_err("Cannot create hsr debugfs root directory\n");

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		hsr_debugfs_root_dir = NULL;

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	}

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}

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void hsr_debugfs_remove_root(void)

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{

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	/* debugfs_remove() internally checks NULL and ERROR */

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	debugfs_remove(hsr_debugfs_root_dir);

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}

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