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 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 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 */ 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 107 hsr_debugfs_term(struct hsr_priv *priv) 108 { 109 debugfs_remove_recursive(priv->node_tbl_root); 110 priv->node_tbl_root = NULL; 111 } 112 113 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 } 121 122 void hsr_debugfs_remove_root(void) 123 { 124 /* debugfs_remove() internally checks NULL and ERROR */ 125 debugfs_remove(hsr_debugfs_root_dir); 126 } 127