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
  49 static int bond_debug_rlb_hash_open(struct inode *inode, struct file *file)
  50 {
  51         return single_open(file, bond_debug_rlb_hash_show, inode->i_private);
  52 }
  53
  54 static const struct file_operations bond_debug_rlb_hash_fops = {
  55         .owner          = THIS_MODULE,
  56         .open           = bond_debug_rlb_hash_open,
  57         .read           = seq_read,
  58         .llseek         = seq_lseek,
  59         .release        = single_release,
  60 };
  61
  62 void bond_debug_register(struct bonding *bond)
  63 {
  64         if (!bonding_debug_root)
  65                 return;
  66
  67         bond->debug_dir =
  68                 debugfs_create_dir(bond->dev->name, bonding_debug_root);
  69
  70         if (!bond->debug_dir) {
  71                 netdev_warn(bond->dev, "failed to register to debugfs\n");
  72                 return;
  73         }
  74
  75         debugfs_create_file("rlb_hash_table", 0400, bond->debug_dir,
  76                                 bond, &bond_debug_rlb_hash_fops);
  77 }
  78
  79 void bond_debug_unregister(struct bonding *bond)
  80 {
  81         if (!bonding_debug_root)
  82                 return;
  83
  84         debugfs_remove_recursive(bond->debug_dir);
  85 }
  86
  87 void bond_debug_reregister(struct bonding *bond)
  88 {
  89         struct dentry *d;
  90
  91         if (!bonding_debug_root)
  92                 return;
  93
  94         d = debugfs_rename(bonding_debug_root, bond->debug_dir,
  95                            bonding_debug_root, bond->dev->name);
  96         if (d) {
  97                 bond->debug_dir = d;
  98         } else {
  99                 netdev_warn(bond->dev, "failed to reregister, so just unregister old one\n");
 100                 bond_debug_unregister(bond);
 101         }
 102 }
 103
 104 void bond_create_debugfs(void)
 105 {
 106         bonding_debug_root = debugfs_create_dir("bonding", NULL);
 107
 108         if (!bonding_debug_root) {
 109                 pr_warn("Warning: Cannot create bonding directory in debugfs\n");
 110         }
 111 }
 112
 113 void bond_destroy_debugfs(void)
 114 {
 115         debugfs_remove_recursive(bonding_debug_root);
 116         bonding_debug_root = NULL;
 117 }
 118
 119
 120 #else /* !CONFIG_DEBUG_FS */
 121
 122 void bond_debug_register(struct bonding *bond)
 123 {
 124 }
 125
 126 void bond_debug_unregister(struct bonding *bond)
 127 {
 128 }
 129
 130 void bond_debug_reregister(struct bonding *bond)
 131 {
 132 }
 133
 134 void bond_create_debugfs(void)
 135 {
 136 }
 137
 138 void bond_destroy_debugfs(void)
 139 {
 140 }
 141
 142 #endif /* CONFIG_DEBUG_FS */