1 /*	Sysfs attributes of bond slaves
2  *
3  *      Copyright (c) 2014 Scott Feldman <sfeldma@cumulusnetworks.com>
4  *
5  *	This program is free software; you can redistribute it and/or
6  *	modify it under the terms of the GNU General Public License
7  *	as published by the Free Software Foundation; either version
8  *	2 of the License, or (at your option) any later version.
9  */
10 
11 #include <linux/capability.h>
12 #include <linux/kernel.h>
13 #include <linux/netdevice.h>
14 
15 #include "bonding.h"
16 
17 struct slave_attribute {
18 	struct attribute attr;
19 	ssize_t (*show)(struct slave *, char *);
20 };
21 
22 #define SLAVE_ATTR(_name, _mode, _show)				\
23 const struct slave_attribute slave_attr_##_name = {		\
24 	.attr = {.name = __stringify(_name),			\
25 		 .mode = _mode },				\
26 	.show	= _show,					\
27 };
28 #define SLAVE_ATTR_RO(_name) \
29 	SLAVE_ATTR(_name, S_IRUGO, _name##_show)
30 
31 static ssize_t state_show(struct slave *slave, char *buf)
32 {
33 	switch (bond_slave_state(slave)) {
34 	case BOND_STATE_ACTIVE:
35 		return sprintf(buf, "active\n");
36 	case BOND_STATE_BACKUP:
37 		return sprintf(buf, "backup\n");
38 	default:
39 		return sprintf(buf, "UNKONWN\n");
40 	}
41 }
42 static SLAVE_ATTR_RO(state);
43 
44 static ssize_t mii_status_show(struct slave *slave, char *buf)
45 {
46 	return sprintf(buf, "%s\n", bond_slave_link_status(slave->link));
47 }
48 static SLAVE_ATTR_RO(mii_status);
49 
50 static ssize_t link_failure_count_show(struct slave *slave, char *buf)
51 {
52 	return sprintf(buf, "%d\n", slave->link_failure_count);
53 }
54 static SLAVE_ATTR_RO(link_failure_count);
55 
56 static ssize_t perm_hwaddr_show(struct slave *slave, char *buf)
57 {
58 	return sprintf(buf, "%pM\n", slave->perm_hwaddr);
59 }
60 static SLAVE_ATTR_RO(perm_hwaddr);
61 
62 static ssize_t queue_id_show(struct slave *slave, char *buf)
63 {
64 	return sprintf(buf, "%d\n", slave->queue_id);
65 }
66 static SLAVE_ATTR_RO(queue_id);
67 
68 static ssize_t ad_aggregator_id_show(struct slave *slave, char *buf)
69 {
70 	const struct aggregator *agg;
71 
72 	if (BOND_MODE(slave->bond) == BOND_MODE_8023AD) {
73 		agg = SLAVE_AD_INFO(slave)->port.aggregator;
74 		if (agg)
75 			return sprintf(buf, "%d\n",
76 				       agg->aggregator_identifier);
77 	}
78 
79 	return sprintf(buf, "N/A\n");
80 }
81 static SLAVE_ATTR_RO(ad_aggregator_id);
82 
83 static const struct slave_attribute *slave_attrs[] = {
84 	&slave_attr_state,
85 	&slave_attr_mii_status,
86 	&slave_attr_link_failure_count,
87 	&slave_attr_perm_hwaddr,
88 	&slave_attr_queue_id,
89 	&slave_attr_ad_aggregator_id,
90 	NULL
91 };
92 
93 #define to_slave_attr(_at) container_of(_at, struct slave_attribute, attr)
94 #define to_slave(obj)	container_of(obj, struct slave, kobj)
95 
96 static ssize_t slave_show(struct kobject *kobj,
97 			  struct attribute *attr, char *buf)
98 {
99 	struct slave_attribute *slave_attr = to_slave_attr(attr);
100 	struct slave *slave = to_slave(kobj);
101 
102 	return slave_attr->show(slave, buf);
103 }
104 
105 static const struct sysfs_ops slave_sysfs_ops = {
106 	.show = slave_show,
107 };
108 
109 static struct kobj_type slave_ktype = {
110 #ifdef CONFIG_SYSFS
111 	.sysfs_ops = &slave_sysfs_ops,
112 #endif
113 };
114 
115 int bond_sysfs_slave_add(struct slave *slave)
116 {
117 	const struct slave_attribute **a;
118 	int err;
119 
120 	err = kobject_init_and_add(&slave->kobj, &slave_ktype,
121 				   &(slave->dev->dev.kobj), "bonding_slave");
122 	if (err)
123 		return err;
124 
125 	for (a = slave_attrs; *a; ++a) {
126 		err = sysfs_create_file(&slave->kobj, &((*a)->attr));
127 		if (err) {
128 			kobject_del(&slave->kobj);
129 			return err;
130 		}
131 	}
132 
133 	return 0;
134 }
135 
136 void bond_sysfs_slave_del(struct slave *slave)
137 {
138 	const struct slave_attribute **a;
139 
140 	for (a = slave_attrs; *a; ++a)
141 		sysfs_remove_file(&slave->kobj, &((*a)->attr));
142 
143 	kobject_del(&slave->kobj);
144 }
145