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