LXR linux/net/hsr/hsr

   1/*
   2 * hsr_debugfs code
   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 void print_mac_address(struct seq_file *sfp, unsigned char *mac)
  24{
  25        seq_printf(sfp, "%02x:%02x:%02x:%02x:%02x:%02x:",
  26                   mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
  27}
  28
  29/* hsr_node_table_show - Formats and prints node_table entries */
  30static int
  31hsr_node_table_show(struct seq_file *sfp, void *data)
  32{
  33        struct hsr_priv *priv = (struct hsr_priv *)sfp->private;
  34        struct hsr_node *node;
  35
  36        seq_puts(sfp, "Node Table entries\n");
  37        seq_puts(sfp, "MAC-Address-A,   MAC-Address-B, time_in[A], ");
  38        seq_puts(sfp, "time_in[B], Address-B port\n");
  39        rcu_read_lock();
  40        list_for_each_entry_rcu(node, &priv->node_db, mac_list) {
  41                /* skip self node */
  42                if (hsr_addr_is_self(priv, node->macaddress_A))
  43                        continue;
  44                print_mac_address(sfp, &node->macaddress_A[0]);
  45                seq_puts(sfp, " ");
  46                print_mac_address(sfp, &node->macaddress_B[0]);
  47                seq_printf(sfp, "0x%lx, ", node->time_in[HSR_PT_SLAVE_A]);
  48                seq_printf(sfp, "0x%lx ", node->time_in[HSR_PT_SLAVE_B]);
  49                seq_printf(sfp, "0x%x\n", node->addr_B_port);
  50        }
  51        rcu_read_unlock();
  52        return 0;
  53}
  54
  55/* hsr_node_table_open - Open the node_table file
  56 *
  57 * Description:
  58 * This routine opens a debugfs file node_table of specific hsr device
  59 */
  60static int
  61hsr_node_table_open(struct inode *inode, struct file *filp)
  62{
  63        return single_open(filp, hsr_node_table_show, inode->i_private);
  64}
  65
  66static const struct file_operations hsr_fops = {
  67        .owner  = THIS_MODULE,
  68        .open   = hsr_node_table_open,
  69        .read   = seq_read,
  70        .llseek = seq_lseek,
  71        .release = single_release,
  72};
  73
  74/* hsr_debugfs_init - create hsr node_table file for dumping
  75 * the node table
  76 *
  77 * Description:
  78 * When debugfs is configured this routine sets up the node_table file per
  79 * hsr device for dumping the node_table entries
  80 */
  81int hsr_debugfs_init(struct hsr_priv *priv, struct net_device *hsr_dev)
  82{
  83        int rc = -1;
  84        struct dentry *de = NULL;
  85
  86        de = debugfs_create_dir(hsr_dev->name, NULL);
  87        if (!de) {
  88                pr_err("Cannot create hsr debugfs root\n");
  89                return rc;
  90        }
  91
  92        priv->node_tbl_root = de;
  93
  94        de = debugfs_create_file("node_table", S_IFREG | 0444,
  95                                 priv->node_tbl_root, priv,
  96                                 &hsr_fops);
  97        if (!de) {
  98                pr_err("Cannot create hsr node_table directory\n");
  99                return rc;
 100        }
 101        priv->node_tbl_file = de;
 102
 103        return 0;
 104}
 105
 106/* hsr_debugfs_term - Tear down debugfs intrastructure
 107 *
 108 * Description:
 109 * When Debufs is configured this routine removes debugfs file system
 110 * elements that are specific to hsr
 111 */
 112void
 113hsr_debugfs_term(struct hsr_priv *priv)
 114{
 115        debugfs_remove(priv->node_tbl_file);
 116        priv->node_tbl_file = NULL;
 117        debugfs_remove(priv->node_tbl_root);
 118        priv->node_tbl_root = NULL;
 119}
 120