drivers/net/bonding/bond_debugfs.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/kernel.h>
   3 #include <linux/module.h>
   4 #include <linux/device.h>
   5 #include <linux/netdevice.h>
   6
   7 #include <net/bonding.h>
   8 #include <net/bond_alb.h>
   9
  10 #if defined(CONFIG_DEBUG_FS) && !defined(CONFIG_NET_NS)
  11
  12 #include <linux/debugfs.h>
  13 #include <linux/seq_file.h>
  14
  15 static struct dentry *bonding_debug_root;
  16
  17 /* Show RLB hash table */
  18 static int bond_debug_rlb_hash_show(struct seq_file *m, void *v)
  19 {
  20         struct bonding *bond = m->private;
  21         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
  22         struct rlb_client_info *client_info;
  23         u32 hash_index;
  24
  25         if (BOND_MODE(bond) != BOND_MODE_ALB)
  26                 return 0;
  27
  28         seq_printf(m, "SourceIP        DestinationIP   "
  29                         "Destination MAC   DEV\n");
  30
  31         spin_lock_bh(&bond->mode_lock);
  32
  33         hash_index = bond_info->rx_hashtbl_used_head;
  34         for (; hash_index != RLB_NULL_INDEX;
  35              hash_index = client_info->used_next) {
  36                 client_info = &(bond_info->rx_hashtbl[hash_index]);
  37                 seq_printf(m, "%-15pI4 %-15pI4 %-17pM %s\n",
  38                         &client_info->ip_src,
  39                         &client_info->ip_dst,
  40                         &client_info->mac_dst,
  41                         client_info->slave->dev->name);
  42         }
  43
  44         spin_unlock_bh(&bond->mode_lock);
  45
  46         return 0;
  47 }
  48 DEFINE_SHOW_ATTRIBUTE(bond_debug_rlb_hash);
  49
  50 void bond_debug_register(struct bonding *bond)
  51 {
  52         if (!bonding_debug_root)
  53                 return;
  54
  55         bond->debug_dir =
  56                 debugfs_create_dir(bond->dev->name, bonding_debug_root);
  57
  58         if (!bond->debug_dir) {
  59                 netdev_warn(bond->dev, "failed to register to debugfs\n");
  60                 return;
  61         }
  62
  63         debugfs_create_file("rlb_hash_table", 0400, bond->debug_dir,
  64                                 bond, &bond_debug_rlb_hash_fops);
  65 }
  66
  67 void bond_debug_unregister(struct bonding *bond)
  68 {
  69         if (!bonding_debug_root)
  70                 return;
  71
  72         debugfs_remove_recursive(bond->debug_dir);
  73 }
  74
  75 void bond_debug_reregister(struct bonding *bond)
  76 {
  77         struct dentry *d;
  78
  79         if (!bonding_debug_root)
  80                 return;
  81
  82         d = debugfs_rename(bonding_debug_root, bond->debug_dir,
  83                            bonding_debug_root, bond->dev->name);
  84         if (d) {
  85                 bond->debug_dir = d;
  86         } else {
  87                 netdev_warn(bond->dev, "failed to reregister, so just unregister old one\n");
  88                 bond_debug_unregister(bond);
  89         }
  90 }
  91
  92 void bond_create_debugfs(void)
  93 {
  94         bonding_debug_root = debugfs_create_dir("bonding", NULL);
  95
  96         if (!bonding_debug_root) {
  97                 pr_warn("Warning: Cannot create bonding directory in debugfs\n");
  98         }
  99 }
 100
 101 void bond_destroy_debugfs(void)
 102 {
 103         debugfs_remove_recursive(bonding_debug_root);
 104         bonding_debug_root = NULL;
 105 }
 106
 107
 108 #else /* !CONFIG_DEBUG_FS */
 109
 110 void bond_debug_register(struct bonding *bond)
 111 {
 112 }
 113
 114 void bond_debug_unregister(struct bonding *bond)
 115 {
 116 }
 117
 118 void bond_debug_reregister(struct bonding *bond)
 119 {
 120 }
 121
 122 void bond_create_debugfs(void)
 123 {
 124 }
 125
 126 void bond_destroy_debugfs(void)
 127 {
 128 }
 129
 130 #endif /* CONFIG_DEBUG_FS */