LXR linux/net/hsr/hsr

   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
  23static struct dentry *hsr_debugfs_root_dir;
  24
  25/* hsr_node_table_show - Formats and prints node_table entries */
  26static int
  27hsr_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
  63DEFINE_SHOW_ATTRIBUTE(hsr_node_table);
  64
  65void 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 */
  85void 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 */
 114void
 115hsr_debugfs_term(struct hsr_priv *priv)
 116{
 117        debugfs_remove_recursive(priv->node_tbl_root);
 118        priv->node_tbl_root = NULL;
 119}
 120
 121void 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
 130void hsr_debugfs_remove_root(void)
 131{
 132        /* debugfs_remove() internally checks NULL and ERROR */
 133        debugfs_remove(hsr_debugfs_root_dir);
 134}
 135