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 23 static struct dentry *hsr_debugfs_root_dir; 24 25 static void print_mac_address(struct seq_file *sfp, unsigned char *mac) 26 { 27 seq_printf(sfp, "%02x:%02x:%02x:%02x:%02x:%02x:", 28 mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]); 29 } 30 31 /* hsr_node_table_show - Formats and prints node_table entries */ 32 static int 33 hsr_node_table_show(struct seq_file *sfp, void *data) 34 { 35 struct hsr_priv *priv = (struct hsr_priv *)sfp->private; 36 struct hsr_node *node; 37 38 seq_puts(sfp, "Node Table entries\n"); 39 seq_puts(sfp, "MAC-Address-A, MAC-Address-B, time_in[A], "); 40 seq_puts(sfp, "time_in[B], Address-B port\n"); 41 rcu_read_lock(); 42 list_for_each_entry_rcu(node, &priv->node_db, mac_list) { 43 /* skip self node */ 44 if (hsr_addr_is_self(priv, node->macaddress_A)) 45 continue; 46 print_mac_address(sfp, &node->macaddress_A[0]); 47 seq_puts(sfp, " "); 48 print_mac_address(sfp, &node->macaddress_B[0]); 49 seq_printf(sfp, "0x%lx, ", node->time_in[HSR_PT_SLAVE_A]); 50 seq_printf(sfp, "0x%lx ", node->time_in[HSR_PT_SLAVE_B]); 51 seq_printf(sfp, "0x%x\n", node->addr_B_port); 52 } 53 rcu_read_unlock(); 54 return 0; 55 } 56 57 /* hsr_node_table_open - Open the node_table file 58 * 59 * Description: 60 * This routine opens a debugfs file node_table of specific hsr device 61 */ 62 static int 63 hsr_node_table_open(struct inode *inode, struct file *filp) 64 { 65 return single_open(filp, hsr_node_table_show, inode->i_private); 66 } 67 68 void hsr_debugfs_rename(struct net_device *dev) 69 { 70 struct hsr_priv *priv = netdev_priv(dev); 71 struct dentry *d; 72 73 d = debugfs_rename(hsr_debugfs_root_dir, priv->node_tbl_root, 74 hsr_debugfs_root_dir, dev->name); 75 if (IS_ERR(d)) 76 netdev_warn(dev, "failed to rename\n"); 77 else 78 priv->node_tbl_root = d; 79 } 80 81 static const struct file_operations hsr_fops = { 82 .open = hsr_node_table_open, 83 .read = seq_read, 84 .llseek = seq_lseek, 85 .release = single_release, 86 }; 87 88 /* hsr_debugfs_init - create hsr node_table file for dumping 89 * the node table 90 * 91 * Description: 92 * When debugfs is configured this routine sets up the node_table file per 93 * hsr device for dumping the node_table entries 94 */ 95 void hsr_debugfs_init(struct hsr_priv *priv, struct net_device *hsr_dev) 96 { 97 struct dentry *de = NULL; 98 99 de = debugfs_create_dir(hsr_dev->name, hsr_debugfs_root_dir); 100 if (IS_ERR(de)) { 101 pr_err("Cannot create hsr debugfs directory\n"); 102 return; 103 } 104 105 priv->node_tbl_root = de; 106 107 de = debugfs_create_file("node_table", S_IFREG | 0444, 108 priv->node_tbl_root, priv, 109 &hsr_fops); 110 if (IS_ERR(de)) { 111 pr_err("Cannot create hsr node_table file\n"); 112 debugfs_remove(priv->node_tbl_root); 113 priv->node_tbl_root = NULL; 114 return; 115 } 116 priv->node_tbl_file = de; 117 } 118 119 /* hsr_debugfs_term - Tear down debugfs intrastructure 120 * 121 * Description: 122 * When Debufs is configured this routine removes debugfs file system 123 * elements that are specific to hsr 124 */ 125 void 126 hsr_debugfs_term(struct hsr_priv *priv) 127 { 128 debugfs_remove(priv->node_tbl_file); 129 priv->node_tbl_file = NULL; 130 debugfs_remove(priv->node_tbl_root); 131 priv->node_tbl_root = NULL; 132 } 133 134 void hsr_debugfs_create_root(void) 135 { 136 hsr_debugfs_root_dir = debugfs_create_dir("hsr", NULL); 137 if (IS_ERR(hsr_debugfs_root_dir)) { 138 pr_err("Cannot create hsr debugfs root directory\n"); 139 hsr_debugfs_root_dir = NULL; 140 } 141 } 142 143 void hsr_debugfs_remove_root(void) 144 { 145 /* debugfs_remove() internally checks NULL and ERROR */ 146 debugfs_remove(hsr_debugfs_root_dir); 147 } 148