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 <net/bonding.h>
16
17struct slave_attribute {
18	struct attribute attr;
19	ssize_t (*show)(struct slave *, char *);
20};
21
22#define SLAVE_ATTR(_name, _mode, _show)				\
23const 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
31static 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, "UNKNOWN\n");
40	}
41}
42static SLAVE_ATTR_RO(state);
43
44static ssize_t mii_status_show(struct slave *slave, char *buf)
45{
46	return sprintf(buf, "%s\n", bond_slave_link_status(slave->link));
47}
48static SLAVE_ATTR_RO(mii_status);
49
50static ssize_t link_failure_count_show(struct slave *slave, char *buf)
51{
52	return sprintf(buf, "%d\n", slave->link_failure_count);
53}
54static SLAVE_ATTR_RO(link_failure_count);
55
56static ssize_t perm_hwaddr_show(struct slave *slave, char *buf)
57{
58	return sprintf(buf, "%pM\n", slave->perm_hwaddr);
59}
60static SLAVE_ATTR_RO(perm_hwaddr);
61
62static ssize_t queue_id_show(struct slave *slave, char *buf)
63{
64	return sprintf(buf, "%d\n", slave->queue_id);
65}
66static SLAVE_ATTR_RO(queue_id);
67
68static 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}
81static SLAVE_ATTR_RO(ad_aggregator_id);
82
83static 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
96static 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
105static const struct sysfs_ops slave_sysfs_ops = {
106	.show = slave_show,
107};
108
109static struct kobj_type slave_ktype = {
110#ifdef CONFIG_SYSFS
111	.sysfs_ops = &slave_sysfs_ops,
112#endif
113};
114
115int 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_put(&slave->kobj);
129			return err;
130		}
131	}
132
133	return 0;
134}
135
136void 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_put(&slave->kobj);
144}
145