1 /* 2 * debugfs code for HSR & PRP 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 <linux/jhash.h> 21 #include "hsr_main.h" 22 #include "hsr_framereg.h" 23 24 static struct dentry *hsr_debugfs_root_dir; 25 26 /* hsr_node_table_show - Formats and prints node_table entries */ 27 static int 28 hsr_node_table_show(struct seq_file *sfp, void *data) 29 { 30 struct hsr_priv *priv = (struct hsr_priv *)sfp->private; 31 struct hsr_node *node; 32 int i; 33 34 seq_printf(sfp, "Node Table entries for (%s) device\n", 35 (priv->prot_version == PRP_V1 ? "PRP" : "HSR")); 36 seq_puts(sfp, "MAC-Address-A, MAC-Address-B, time_in[A], "); 37 seq_puts(sfp, "time_in[B], Address-B port, "); 38 if (priv->prot_version == PRP_V1) 39 seq_puts(sfp, "SAN-A, SAN-B, DAN-P\n"); 40 else 41 seq_puts(sfp, "DAN-H\n"); 42 43 rcu_read_lock(); 44 45 for (i = 0 ; i < priv->hash_buckets; i++) { 46 hlist_for_each_entry_rcu(node, &priv->node_db[i], mac_list) { 47 /* skip self node */ 48 if (hsr_addr_is_self(priv, node->macaddress_A)) 49 continue; 50 seq_printf(sfp, "%pM ", &node->macaddress_A[0]); 51 seq_printf(sfp, "%pM ", &node->macaddress_B[0]); 52 seq_printf(sfp, "%10lx, ", 53 node->time_in[HSR_PT_SLAVE_A]); 54 seq_printf(sfp, "%10lx, ", 55 node->time_in[HSR_PT_SLAVE_B]); 56 seq_printf(sfp, "%14x, ", node->addr_B_port); 57 58 if (priv->prot_version == PRP_V1) 59 seq_printf(sfp, "%5x, %5x, %5x\n", 60 node->san_a, node->san_b, 61 (node->san_a == 0 && 62 node->san_b == 0)); 63 else 64 seq_printf(sfp, "%5x\n", 1); 65 } 66 } 67 rcu_read_unlock(); 68 return 0; 69 } 70 71 DEFINE_SHOW_ATTRIBUTE(hsr_node_table); 72 73 void hsr_debugfs_rename(struct net_device *dev) 74 { 75 struct hsr_priv *priv = netdev_priv(dev); 76 struct dentry *d; 77 78 d = debugfs_rename(hsr_debugfs_root_dir, priv->node_tbl_root, 79 hsr_debugfs_root_dir, dev->name); 80 if (IS_ERR(d)) 81 netdev_warn(dev, "failed to rename\n"); 82 else 83 priv->node_tbl_root = d; 84 } 85 86 /* hsr_debugfs_init - create hsr node_table file for dumping 87 * the node table 88 * 89 * Description: 90 * When debugfs is configured this routine sets up the node_table file per 91 * hsr device for dumping the node_table entries 92 */ 93 void hsr_debugfs_init(struct hsr_priv *priv, struct net_device *hsr_dev) 94 { 95 struct dentry *de = NULL; 96 97 de = debugfs_create_dir(hsr_dev->name, hsr_debugfs_root_dir); 98 if (IS_ERR(de)) { 99 pr_err("Cannot create hsr debugfs directory\n"); 100 return; 101 } 102 103 priv->node_tbl_root = de; 104 105 de = debugfs_create_file("node_table", S_IFREG | 0444, 106 priv->node_tbl_root, priv, 107 &hsr_node_table_fops); 108 if (IS_ERR(de)) { 109 pr_err("Cannot create hsr node_table file\n"); 110 debugfs_remove(priv->node_tbl_root); 111 priv->node_tbl_root = NULL; 112 return; 113 } 114 } 115 116 /* hsr_debugfs_term - Tear down debugfs intrastructure 117 * 118 * Description: 119 * When Debugfs is configured this routine removes debugfs file system 120 * elements that are specific to hsr 121 */ 122 void 123 hsr_debugfs_term(struct hsr_priv *priv) 124 { 125 debugfs_remove_recursive(priv->node_tbl_root); 126 priv->node_tbl_root = NULL; 127 } 128 129 void hsr_debugfs_create_root(void) 130 { 131 hsr_debugfs_root_dir = debugfs_create_dir("hsr", NULL); 132 if (IS_ERR(hsr_debugfs_root_dir)) { 133 pr_err("Cannot create hsr debugfs root directory\n"); 134 hsr_debugfs_root_dir = NULL; 135 } 136 } 137 138 void hsr_debugfs_remove_root(void) 139 { 140 /* debugfs_remove() internally checks NULL and ERROR */ 141 debugfs_remove(hsr_debugfs_root_dir); 142 } 143