net/hsr/hsr_debugfs.c

   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 <linux/jhash.h>
  13 #include "hsr_main.h"
  14 #include "hsr_framereg.h"
  15
  16 static struct dentry *hsr_debugfs_root_dir;
  17
  18 /* hsr_node_table_show - Formats and prints node_table entries */
  19 static int
  20 hsr_node_table_show(struct seq_file *sfp, void *data)
  21 {
  22         struct hsr_priv *priv = (struct hsr_priv *)sfp->private;
  23         struct hsr_node *node;
  24         int i;
  25
  26         seq_printf(sfp, "Node Table entries for (%s) device\n",
  27                    (priv->prot_version == PRP_V1 ? "PRP" : "HSR"));
  28         seq_puts(sfp, "MAC-Address-A,    MAC-Address-B,    time_in[A], ");
  29         seq_puts(sfp, "time_in[B], Address-B port, ");
  30         if (priv->prot_version == PRP_V1)
  31                 seq_puts(sfp, "SAN-A, SAN-B, DAN-P\n");
  32         else
  33                 seq_puts(sfp, "DAN-H\n");
  34
  35         rcu_read_lock();
  36
  37         for (i = 0 ; i < priv->hash_buckets; i++) {
  38                 hlist_for_each_entry_rcu(node, &priv->node_db[i], mac_list) {
  39                         /* skip self node */
  40                         if (hsr_addr_is_self(priv, node->macaddress_A))
  41                                 continue;
  42                         seq_printf(sfp, "%pM ", &node->macaddress_A[0]);
  43                         seq_printf(sfp, "%pM ", &node->macaddress_B[0]);
  44                         seq_printf(sfp, "%10lx, ",
  45                                    node->time_in[HSR_PT_SLAVE_A]);
  46                         seq_printf(sfp, "%10lx, ",
  47                                    node->time_in[HSR_PT_SLAVE_B]);
  48                         seq_printf(sfp, "%14x, ", node->addr_B_port);
  49
  50                         if (priv->prot_version == PRP_V1)
  51                                 seq_printf(sfp, "%5x, %5x, %5x\n",
  52                                            node->san_a, node->san_b,
  53                                            (node->san_a == 0 &&
  54                                             node->san_b == 0));
  55                         else
  56                                 seq_printf(sfp, "%5x\n", 1);
  57                 }
  58         }
  59         rcu_read_unlock();
  60         return 0;
  61 }
  62
  63 DEFINE_SHOW_ATTRIBUTE(hsr_node_table);
  64
  65 void hsr_debugfs_rename(struct net_device *dev)
  66 {
  67         struct hsr_priv *priv = netdev_priv(dev);
  68         struct dentry *d;
  69
  70         d = debugfs_rename(hsr_debugfs_root_dir, priv->node_tbl_root,
  71                            hsr_debugfs_root_dir, dev->name);
  72         if (IS_ERR(d))
  73                 netdev_warn(dev, "failed to rename\n");
  74         else
  75                 priv->node_tbl_root = d;
  76 }
  77
  78 /* hsr_debugfs_init - create hsr node_table file for dumping
  79  * the node table
  80  *
  81  * Description:
  82  * When debugfs is configured this routine sets up the node_table file per
  83  * hsr device for dumping the node_table entries
  84  */
  85 void hsr_debugfs_init(struct hsr_priv *priv, struct net_device *hsr_dev)
  86 {
  87         struct dentry *de = NULL;
  88
  89         de = debugfs_create_dir(hsr_dev->name, hsr_debugfs_root_dir);
  90         if (IS_ERR(de)) {
  91                 pr_err("Cannot create hsr debugfs directory\n");
  92                 return;
  93         }
  94
  95         priv->node_tbl_root = de;
  96
  97         de = debugfs_create_file("node_table", S_IFREG | 0444,
  98                                  priv->node_tbl_root, priv,
  99                                  &hsr_node_table_fops);
 100         if (IS_ERR(de)) {
 101                 pr_err("Cannot create hsr node_table file\n");
 102                 debugfs_remove(priv->node_tbl_root);
 103                 priv->node_tbl_root = NULL;
 104                 return;
 105         }
 106 }
 107
 108 /* hsr_debugfs_term - Tear down debugfs intrastructure
 109  *
 110  * Description:
 111  * When Debugfs is configured this routine removes debugfs file system
 112  * elements that are specific to hsr
 113  */
 114 void
 115 hsr_debugfs_term(struct hsr_priv *priv)
 116 {
 117         debugfs_remove_recursive(priv->node_tbl_root);
 118         priv->node_tbl_root = NULL;
 119 }
 120
 121 void hsr_debugfs_create_root(void)
 122 {
 123         hsr_debugfs_root_dir = debugfs_create_dir("hsr", NULL);
 124         if (IS_ERR(hsr_debugfs_root_dir)) {
 125                 pr_err("Cannot create hsr debugfs root directory\n");
 126                 hsr_debugfs_root_dir = NULL;
 127         }
 128 }
 129
 130 void hsr_debugfs_remove_root(void)
 131 {
 132         /* debugfs_remove() internally checks NULL and ERROR */
 133         debugfs_remove(hsr_debugfs_root_dir);
 134 }