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1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * debugfs code for HSR & PRP
4  * Copyright (C) 2019 Texas Instruments Incorporated
5  *
6  * Author(s):
7  *	Murali Karicheri <m-karicheri2@ti.com>
8  */
9 #include <linux/module.h>
10 #include <linux/errno.h>
11 #include <linux/debugfs.h>
12 #include "hsr_main.h"
13 #include "hsr_framereg.h"
14 
15 static struct dentry *hsr_debugfs_root_dir;
16 
17 /* hsr_node_table_show - Formats and prints node_table entries */
18 static int
hsr_node_table_show(struct seq_file * sfp,void * data)19 hsr_node_table_show(struct seq_file *sfp, void *data)
20 {
21 	struct hsr_priv *priv = (struct hsr_priv *)sfp->private;
22 	struct hsr_node *node;
23 
24 	seq_printf(sfp, "Node Table entries for (%s) device\n",
25 		   (priv->prot_version == PRP_V1 ? "PRP" : "HSR"));
26 	seq_puts(sfp, "MAC-Address-A,    MAC-Address-B,    time_in[A], ");
27 	seq_puts(sfp, "time_in[B], Address-B port, ");
28 	if (priv->prot_version == PRP_V1)
29 		seq_puts(sfp, "SAN-A, SAN-B, DAN-P\n");
30 	else
31 		seq_puts(sfp, "DAN-H\n");
32 
33 	rcu_read_lock();
34 	list_for_each_entry_rcu(node, &priv->node_db, mac_list) {
35 		/* skip self node */
36 		if (hsr_addr_is_self(priv, node->macaddress_A))
37 			continue;
38 		seq_printf(sfp, "%pM ", &node->macaddress_A[0]);
39 		seq_printf(sfp, "%pM ", &node->macaddress_B[0]);
40 		seq_printf(sfp, "%10lx, ", node->time_in[HSR_PT_SLAVE_A]);
41 		seq_printf(sfp, "%10lx, ", node->time_in[HSR_PT_SLAVE_B]);
42 		seq_printf(sfp, "%14x, ", node->addr_B_port);
43 
44 		if (priv->prot_version == PRP_V1)
45 			seq_printf(sfp, "%5x, %5x, %5x\n",
46 				   node->san_a, node->san_b,
47 				   (node->san_a == 0 && node->san_b == 0));
48 		else
49 			seq_printf(sfp, "%5x\n", 1);
50 	}
51 	rcu_read_unlock();
52 	return 0;
53 }
54 
55 DEFINE_SHOW_ATTRIBUTE(hsr_node_table);
56 
hsr_debugfs_rename(struct net_device * dev)57 void hsr_debugfs_rename(struct net_device *dev)
58 {
59 	struct hsr_priv *priv = netdev_priv(dev);
60 	struct dentry *d;
61 
62 	d = debugfs_rename(hsr_debugfs_root_dir, priv->node_tbl_root,
63 			   hsr_debugfs_root_dir, dev->name);
64 	if (IS_ERR(d))
65 		netdev_warn(dev, "failed to rename\n");
66 	else
67 		priv->node_tbl_root = d;
68 }
69 
70 /* hsr_debugfs_init - create hsr node_table file for dumping
71  * the node table
72  *
73  * Description:
74  * When debugfs is configured this routine sets up the node_table file per
75  * hsr device for dumping the node_table entries
76  */
hsr_debugfs_init(struct hsr_priv * priv,struct net_device * hsr_dev)77 void hsr_debugfs_init(struct hsr_priv *priv, struct net_device *hsr_dev)
78 {
79 	struct dentry *de = NULL;
80 
81 	de = debugfs_create_dir(hsr_dev->name, hsr_debugfs_root_dir);
82 	if (IS_ERR(de)) {
83 		pr_err("Cannot create hsr debugfs directory\n");
84 		return;
85 	}
86 
87 	priv->node_tbl_root = de;
88 
89 	de = debugfs_create_file("node_table", S_IFREG | 0444,
90 				 priv->node_tbl_root, priv,
91 				 &hsr_node_table_fops);
92 	if (IS_ERR(de)) {
93 		pr_err("Cannot create hsr node_table file\n");
94 		debugfs_remove(priv->node_tbl_root);
95 		priv->node_tbl_root = NULL;
96 		return;
97 	}
98 }
99 
100 /* hsr_debugfs_term - Tear down debugfs intrastructure
101  *
102  * Description:
103  * When Debugfs is configured this routine removes debugfs file system
104  * elements that are specific to hsr
105  */
106 void
hsr_debugfs_term(struct hsr_priv * priv)107 hsr_debugfs_term(struct hsr_priv *priv)
108 {
109 	debugfs_remove_recursive(priv->node_tbl_root);
110 	priv->node_tbl_root = NULL;
111 }
112 
hsr_debugfs_create_root(void)113 void hsr_debugfs_create_root(void)
114 {
115 	hsr_debugfs_root_dir = debugfs_create_dir("hsr", NULL);
116 	if (IS_ERR(hsr_debugfs_root_dir)) {
117 		pr_err("Cannot create hsr debugfs root directory\n");
118 		hsr_debugfs_root_dir = NULL;
119 	}
120 }
121 
hsr_debugfs_remove_root(void)122 void hsr_debugfs_remove_root(void)
123 {
124 	/* debugfs_remove() internally checks NULL and ERROR */
125 	debugfs_remove(hsr_debugfs_root_dir);
126 }
127