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 */
142