1 /*
2 * hsr_debugfs code
3 * Copyright (C) 2019 Texas Instruments Incorporated
4 *
5 * Author(s):
6 * Murali Karicheri <m-karicheri2@ti.com>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation version 2.
11 *
12 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
13 * kind, whether express or implied; without even the implied warranty
14 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 */
17 #include <linux/module.h>
18 #include <linux/errno.h>
19 #include <linux/debugfs.h>
20 #include "hsr_main.h"
21 #include "hsr_framereg.h"
22
print_mac_address(struct seq_file * sfp,unsigned char * mac)23 static void print_mac_address(struct seq_file *sfp, unsigned char *mac)
24 {
25 seq_printf(sfp, "%02x:%02x:%02x:%02x:%02x:%02x:",
26 mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
27 }
28
29 /* hsr_node_table_show - Formats and prints node_table entries */
30 static int
hsr_node_table_show(struct seq_file * sfp,void * data)31 hsr_node_table_show(struct seq_file *sfp, void *data)
32 {
33 struct hsr_priv *priv = (struct hsr_priv *)sfp->private;
34 struct hsr_node *node;
35
36 seq_puts(sfp, "Node Table entries\n");
37 seq_puts(sfp, "MAC-Address-A, MAC-Address-B, time_in[A], ");
38 seq_puts(sfp, "time_in[B], Address-B port\n");
39 rcu_read_lock();
40 list_for_each_entry_rcu(node, &priv->node_db, mac_list) {
41 /* skip self node */
42 if (hsr_addr_is_self(priv, node->macaddress_A))
43 continue;
44 print_mac_address(sfp, &node->macaddress_A[0]);
45 seq_puts(sfp, " ");
46 print_mac_address(sfp, &node->macaddress_B[0]);
47 seq_printf(sfp, "0x%lx, ", node->time_in[HSR_PT_SLAVE_A]);
48 seq_printf(sfp, "0x%lx ", node->time_in[HSR_PT_SLAVE_B]);
49 seq_printf(sfp, "0x%x\n", node->addr_B_port);
50 }
51 rcu_read_unlock();
52 return 0;
53 }
54
55 /* hsr_node_table_open - Open the node_table file
56 *
57 * Description:
58 * This routine opens a debugfs file node_table of specific hsr device
59 */
60 static int
hsr_node_table_open(struct inode * inode,struct file * filp)61 hsr_node_table_open(struct inode *inode, struct file *filp)
62 {
63 return single_open(filp, hsr_node_table_show, inode->i_private);
64 }
65
66 static const struct file_operations hsr_fops = {
67 .owner = THIS_MODULE,
68 .open = hsr_node_table_open,
69 .read = seq_read,
70 .llseek = seq_lseek,
71 .release = single_release,
72 };
73
74 /* hsr_debugfs_init - create hsr node_table file for dumping
75 * the node table
76 *
77 * Description:
78 * When debugfs is configured this routine sets up the node_table file per
79 * hsr device for dumping the node_table entries
80 */
hsr_debugfs_init(struct hsr_priv * priv,struct net_device * hsr_dev)81 int hsr_debugfs_init(struct hsr_priv *priv, struct net_device *hsr_dev)
82 {
83 int rc = -1;
84 struct dentry *de = NULL;
85
86 de = debugfs_create_dir(hsr_dev->name, NULL);
87 if (!de) {
88 pr_err("Cannot create hsr debugfs root\n");
89 return rc;
90 }
91
92 priv->node_tbl_root = de;
93
94 de = debugfs_create_file("node_table", S_IFREG | 0444,
95 priv->node_tbl_root, priv,
96 &hsr_fops);
97 if (!de) {
98 pr_err("Cannot create hsr node_table directory\n");
99 return rc;
100 }
101 priv->node_tbl_file = de;
102
103 return 0;
104 }
105
106 /* hsr_debugfs_term - Tear down debugfs intrastructure
107 *
108 * Description:
109 * When Debufs is configured this routine removes debugfs file system
110 * elements that are specific to hsr
111 */
112 void
hsr_debugfs_term(struct hsr_priv * priv)113 hsr_debugfs_term(struct hsr_priv *priv)
114 {
115 debugfs_remove(priv->node_tbl_file);
116 priv->node_tbl_file = NULL;
117 debugfs_remove(priv->node_tbl_root);
118 priv->node_tbl_root = NULL;
119 }
120
