net/hsr/hsr_debugfs.c

   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 "hsr_main.h"
  21 #include "hsr_framereg.h"
  22
  23 static struct dentry *hsr_debugfs_root_dir;
  24
  25 /* hsr_node_table_show - Formats and prints node_table entries */
  26 static int
  27 hsr_node_table_show(struct seq_file *sfp, void *data)
  28 {
  29         struct hsr_priv *priv = (struct hsr_priv *)sfp->private;
  30         struct hsr_node *node;
  31
  32         seq_printf(sfp, "Node Table entries for (%s) device\n",
  33                    (priv->prot_version == PRP_V1 ? "PRP" : "HSR"));
  34         seq_puts(sfp, "MAC-Address-A,    MAC-Address-B,    time_in[A], ");
  35         seq_puts(sfp, "time_in[B], Address-B port, ");
  36         if (priv->prot_version == PRP_V1)
  37                 seq_puts(sfp, "SAN-A, SAN-B, DAN-P\n");
  38         else
  39                 seq_puts(sfp, "DAN-H\n");
  40
  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                 seq_printf(sfp, "%pM ", &node->macaddress_A[0]);
  47                 seq_printf(sfp, "%pM ", &node->macaddress_B[0]);
  48                 seq_printf(sfp, "%10lx, ", node->time_in[HSR_PT_SLAVE_A]);
  49                 seq_printf(sfp, "%10lx, ", node->time_in[HSR_PT_SLAVE_B]);
  50                 seq_printf(sfp, "%14x, ", node->addr_B_port);
  51
  52                 if (priv->prot_version == PRP_V1)
  53                         seq_printf(sfp, "%5x, %5x, %5x\n",
  54                                    node->san_a, node->san_b,
  55                                    (node->san_a == 0 && node->san_b == 0));
  56                 else
  57                         seq_printf(sfp, "%5x\n", 1);
  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 Debufs 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 }