drivers/net/bonding/bond_debugfs.c

   1 #include <linux/kernel.h>
   2 #include <linux/module.h>
   3 #include <linux/device.h>
   4 #include <linux/netdevice.h>
   5
   6 #include "bonding.h"
   7 #include "bond_alb.h"
   8
   9 #if defined(CONFIG_DEBUG_FS) && !defined(CONFIG_NET_NS)
  10
  11 #include <linux/debugfs.h>
  12 #include <linux/seq_file.h>
  13
  14 static struct dentry *bonding_debug_root;
  15
  16 /*
  17  *  Show RLB hash table
  18  */
  19 static int bond_debug_rlb_hash_show(struct seq_file *m, void *v)
  20 {
  21         struct bonding *bond = m->private;
  22         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
  23         struct rlb_client_info *client_info;
  24         u32 hash_index;
  25
  26         if (bond->params.mode != BOND_MODE_ALB)
  27                 return 0;
  28
  29         seq_printf(m, "SourceIP        DestinationIP   "
  30                         "Destination MAC   DEV\n");
  31
  32         spin_lock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock));
  33
  34         hash_index = bond_info->rx_hashtbl_used_head;
  35         for (; hash_index != RLB_NULL_INDEX;
  36              hash_index = client_info->used_next) {
  37                 client_info = &(bond_info->rx_hashtbl[hash_index]);
  38                 seq_printf(m, "%-15pI4 %-15pI4 %-17pM %s\n",
  39                         &client_info->ip_src,
  40                         &client_info->ip_dst,
  41                         &client_info->mac_dst,
  42                         client_info->slave->dev->name);
  43         }
  44
  45         spin_unlock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock));
  46
  47         return 0;
  48 }
  49
  50 static int bond_debug_rlb_hash_open(struct inode *inode, struct file *file)
  51 {
  52         return single_open(file, bond_debug_rlb_hash_show, inode->i_private);
  53 }
  54
  55 static const struct file_operations bond_debug_rlb_hash_fops = {
  56         .owner          = THIS_MODULE,
  57         .open           = bond_debug_rlb_hash_open,
  58         .read           = seq_read,
  59         .llseek         = seq_lseek,
  60         .release        = single_release,
  61 };
  62
  63 void bond_debug_register(struct bonding *bond)
  64 {
  65         if (!bonding_debug_root)
  66                 return;
  67
  68         bond->debug_dir =
  69                 debugfs_create_dir(bond->dev->name, bonding_debug_root);
  70
  71         if (!bond->debug_dir) {
  72                 pr_warn("%s: Warning: failed to register to debugfs\n",
  73                         bond->dev->name);
  74                 return;
  75         }
  76
  77         debugfs_create_file("rlb_hash_table", 0400, bond->debug_dir,
  78                                 bond, &bond_debug_rlb_hash_fops);
  79 }
  80
  81 void bond_debug_unregister(struct bonding *bond)
  82 {
  83         if (!bonding_debug_root)
  84                 return;
  85
  86         debugfs_remove_recursive(bond->debug_dir);
  87 }
  88
  89 void bond_debug_reregister(struct bonding *bond)
  90 {
  91         struct dentry *d;
  92
  93         if (!bonding_debug_root)
  94                 return;
  95
  96         d = debugfs_rename(bonding_debug_root, bond->debug_dir,
  97                            bonding_debug_root, bond->dev->name);
  98         if (d) {
  99                 bond->debug_dir = d;
 100         } else {
 101                 pr_warn("%s: Warning: failed to reregister, so just unregister old one\n",
 102                         bond->dev->name);
 103                 bond_debug_unregister(bond);
 104         }
 105 }
 106
 107 void bond_create_debugfs(void)
 108 {
 109         bonding_debug_root = debugfs_create_dir("bonding", NULL);
 110
 111         if (!bonding_debug_root) {
 112                 pr_warn("Warning: Cannot create bonding directory in debugfs\n");
 113         }
 114 }
 115
 116 void bond_destroy_debugfs(void)
 117 {
 118         debugfs_remove_recursive(bonding_debug_root);
 119         bonding_debug_root = NULL;
 120 }
 121
 122
 123 #else /* !CONFIG_DEBUG_FS */
 124
 125 void bond_debug_register(struct bonding *bond)
 126 {
 127 }
 128
 129 void bond_debug_unregister(struct bonding *bond)
 130 {
 131 }
 132
 133 void bond_debug_reregister(struct bonding *bond)
 134 {
 135 }
 136
 137 void bond_create_debugfs(void)
 138 {
 139 }
 140
 141 void bond_destroy_debugfs(void)
 142 {
 143 }
 144
 145 #endif /* CONFIG_DEBUG_FS */