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