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_MODE(bond) != 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 */
146