[PATCH] kobject/hotplug split - net bridge
[sfrench/cifs-2.6.git] / net / bridge / br_sysfs_if.c
1 /*
2  *      Sysfs attributes of bridge ports
3  *      Linux ethernet bridge
4  *
5  *      Authors:
6  *      Stephen Hemminger               <shemminger@osdl.org>
7  *
8  *      This program is free software; you can redistribute it and/or
9  *      modify it under the terms of the GNU General Public License
10  *      as published by the Free Software Foundation; either version
11  *      2 of the License, or (at your option) any later version.
12  */
13
14 #include <linux/kernel.h>
15 #include <linux/netdevice.h>
16 #include <linux/if_bridge.h>
17 #include <linux/rtnetlink.h>
18 #include <linux/spinlock.h>
19
20 #include "br_private.h"
21
22 struct brport_attribute {
23         struct attribute        attr;
24         ssize_t (*show)(struct net_bridge_port *, char *);
25         ssize_t (*store)(struct net_bridge_port *, unsigned long);
26 };
27
28 #define BRPORT_ATTR(_name,_mode,_show,_store)                   \
29 struct brport_attribute brport_attr_##_name = {                 \
30         .attr = {.name = __stringify(_name),                    \
31                  .mode = _mode,                                 \
32                  .owner = THIS_MODULE, },                       \
33         .show   = _show,                                        \
34         .store  = _store,                                       \
35 };
36
37 static ssize_t show_path_cost(struct net_bridge_port *p, char *buf)
38 {
39         return sprintf(buf, "%d\n", p->path_cost);
40 }
41 static ssize_t store_path_cost(struct net_bridge_port *p, unsigned long v)
42 {
43         br_stp_set_path_cost(p, v);
44         return 0;
45 }
46 static BRPORT_ATTR(path_cost, S_IRUGO | S_IWUSR,
47                    show_path_cost, store_path_cost);
48
49 static ssize_t show_priority(struct net_bridge_port *p, char *buf)
50 {
51         return sprintf(buf, "%d\n", p->priority);
52 }
53 static ssize_t store_priority(struct net_bridge_port *p, unsigned long v)
54 {
55         if (v >= (1<<(16-BR_PORT_BITS)))
56                 return -ERANGE;
57         br_stp_set_port_priority(p, v);
58         return 0;
59 }
60 static BRPORT_ATTR(priority, S_IRUGO | S_IWUSR,
61                          show_priority, store_priority);
62
63 static ssize_t show_designated_root(struct net_bridge_port *p, char *buf)
64 {
65         return br_show_bridge_id(buf, &p->designated_root);
66 }
67 static BRPORT_ATTR(designated_root, S_IRUGO, show_designated_root, NULL);
68
69 static ssize_t show_designated_bridge(struct net_bridge_port *p, char *buf)
70 {
71         return br_show_bridge_id(buf, &p->designated_bridge);
72 }
73 static BRPORT_ATTR(designated_bridge, S_IRUGO, show_designated_bridge, NULL);
74
75 static ssize_t show_designated_port(struct net_bridge_port *p, char *buf)
76 {
77         return sprintf(buf, "%d\n", p->designated_port);
78 }
79 static BRPORT_ATTR(designated_port, S_IRUGO, show_designated_port, NULL);
80
81 static ssize_t show_designated_cost(struct net_bridge_port *p, char *buf)
82 {
83         return sprintf(buf, "%d\n", p->designated_cost);
84 }
85 static BRPORT_ATTR(designated_cost, S_IRUGO, show_designated_cost, NULL);
86
87 static ssize_t show_port_id(struct net_bridge_port *p, char *buf)
88 {
89         return sprintf(buf, "0x%x\n", p->port_id);
90 }
91 static BRPORT_ATTR(port_id, S_IRUGO, show_port_id, NULL);
92
93 static ssize_t show_port_no(struct net_bridge_port *p, char *buf)
94 {
95         return sprintf(buf, "0x%x\n", p->port_no);
96 }
97
98 static BRPORT_ATTR(port_no, S_IRUGO, show_port_no, NULL);
99
100 static ssize_t show_change_ack(struct net_bridge_port *p, char *buf)
101 {
102         return sprintf(buf, "%d\n", p->topology_change_ack);
103 }
104 static BRPORT_ATTR(change_ack, S_IRUGO, show_change_ack, NULL);
105
106 static ssize_t show_config_pending(struct net_bridge_port *p, char *buf)
107 {
108         return sprintf(buf, "%d\n", p->config_pending);
109 }
110 static BRPORT_ATTR(config_pending, S_IRUGO, show_config_pending, NULL);
111
112 static ssize_t show_port_state(struct net_bridge_port *p, char *buf)
113 {
114         return sprintf(buf, "%d\n", p->state);
115 }
116 static BRPORT_ATTR(state, S_IRUGO, show_port_state, NULL);
117
118 static ssize_t show_message_age_timer(struct net_bridge_port *p,
119                                             char *buf)
120 {
121         return sprintf(buf, "%ld\n", br_timer_value(&p->message_age_timer));
122 }
123 static BRPORT_ATTR(message_age_timer, S_IRUGO, show_message_age_timer, NULL);
124
125 static ssize_t show_forward_delay_timer(struct net_bridge_port *p,
126                                             char *buf)
127 {
128         return sprintf(buf, "%ld\n", br_timer_value(&p->forward_delay_timer));
129 }
130 static BRPORT_ATTR(forward_delay_timer, S_IRUGO, show_forward_delay_timer, NULL);
131
132 static ssize_t show_hold_timer(struct net_bridge_port *p,
133                                             char *buf)
134 {
135         return sprintf(buf, "%ld\n", br_timer_value(&p->hold_timer));
136 }
137 static BRPORT_ATTR(hold_timer, S_IRUGO, show_hold_timer, NULL);
138
139 static struct brport_attribute *brport_attrs[] = {
140         &brport_attr_path_cost,
141         &brport_attr_priority,
142         &brport_attr_port_id,
143         &brport_attr_port_no,
144         &brport_attr_designated_root,
145         &brport_attr_designated_bridge,
146         &brport_attr_designated_port,
147         &brport_attr_designated_cost,
148         &brport_attr_state,
149         &brport_attr_change_ack,
150         &brport_attr_config_pending,
151         &brport_attr_message_age_timer,
152         &brport_attr_forward_delay_timer,
153         &brport_attr_hold_timer,
154         NULL
155 };
156
157 #define to_brport_attr(_at) container_of(_at, struct brport_attribute, attr)
158 #define to_brport(obj)  container_of(obj, struct net_bridge_port, kobj)
159
160 static ssize_t brport_show(struct kobject * kobj,
161                            struct attribute * attr, char * buf)
162 {
163         struct brport_attribute * brport_attr = to_brport_attr(attr);
164         struct net_bridge_port * p = to_brport(kobj);
165
166         return brport_attr->show(p, buf);
167 }
168
169 static ssize_t brport_store(struct kobject * kobj,
170                             struct attribute * attr,
171                             const char * buf, size_t count)
172 {
173         struct brport_attribute * brport_attr = to_brport_attr(attr);
174         struct net_bridge_port * p = to_brport(kobj);
175         ssize_t ret = -EINVAL;
176         char *endp;
177         unsigned long val;
178
179         if (!capable(CAP_NET_ADMIN))
180                 return -EPERM;
181
182         val = simple_strtoul(buf, &endp, 0);
183         if (endp != buf) {
184                 rtnl_lock();
185                 if (p->dev && p->br && brport_attr->store) {
186                         spin_lock_bh(&p->br->lock);
187                         ret = brport_attr->store(p, val);
188                         spin_unlock_bh(&p->br->lock);
189                         if (ret == 0)
190                                 ret = count;
191                 }
192                 rtnl_unlock();
193         }
194         return ret;
195 }
196
197 /* called from kobject_put when port ref count goes to zero. */
198 static void brport_release(struct kobject *kobj)
199 {
200         kfree(container_of(kobj, struct net_bridge_port, kobj));
201 }
202
203 static struct sysfs_ops brport_sysfs_ops = {
204         .show = brport_show,
205         .store = brport_store,
206 };
207
208 static struct kobj_type brport_ktype = {
209         .sysfs_ops = &brport_sysfs_ops,
210         .release = brport_release,
211 };
212
213
214 /*
215  * Add sysfs entries to ethernet device added to a bridge.
216  * Creates a brport subdirectory with bridge attributes.
217  * Puts symlink in bridge's brport subdirectory
218  */
219 int br_sysfs_addif(struct net_bridge_port *p)
220 {
221         struct net_bridge *br = p->br;
222         struct brport_attribute **a;
223         int err;
224
225         ASSERT_RTNL();
226
227         kobject_set_name(&p->kobj, SYSFS_BRIDGE_PORT_ATTR);
228         p->kobj.ktype = &brport_ktype;
229         p->kobj.parent = &(p->dev->class_dev.kobj);
230         p->kobj.kset = NULL;
231
232         err = kobject_add(&p->kobj);
233         if(err)
234                 goto out1;
235
236         err = sysfs_create_link(&p->kobj, &br->dev->class_dev.kobj, 
237                                 SYSFS_BRIDGE_PORT_LINK);
238         if (err)
239                 goto out2;
240
241         for (a = brport_attrs; *a; ++a) {
242                 err = sysfs_create_file(&p->kobj, &((*a)->attr));
243                 if (err)
244                         goto out2;
245         }
246
247         err = sysfs_create_link(&br->ifobj, &p->kobj, p->dev->name);
248         if (err)
249                 goto out2;
250
251         kobject_hotplug(&p->kobj, KOBJ_ADD);
252         return 0;
253  out2:
254         kobject_del(&p->kobj);
255  out1:
256         return err;
257 }
258
259 void br_sysfs_removeif(struct net_bridge_port *p)
260 {
261         pr_debug("br_sysfs_removeif\n");
262         sysfs_remove_link(&p->br->ifobj, p->dev->name);
263         kobject_hotplug(&p->kobj, KOBJ_REMOVE);
264         kobject_del(&p->kobj);
265 }
266
267 void br_sysfs_freeif(struct net_bridge_port *p)
268 {
269         pr_debug("br_sysfs_freeif\n");
270         kobject_put(&p->kobj);
271 }