datapath/brc_sysfs_if.c

   1 /*
   2  *      Sysfs attributes of bridge ports for Open vSwitch
   3  *
   4  *  This has been shamelessly copied from the kernel sources.
   5  */
   6
   7 #include <linux/capability.h>
   8 #include <linux/kernel.h>
   9 #include <linux/netdevice.h>
  10 #include <linux/if_bridge.h>
  11 #include <linux/rtnetlink.h>
  12 #include <linux/spinlock.h>
  13 #include "brc_sysfs.h"
  14 #include "datapath.h"
  15
  16 #ifdef SUPPORT_SYSFS
  17
  18 struct brport_attribute {
  19         struct attribute        attr;
  20         ssize_t (*show)(struct net_bridge_port *, char *);
  21         ssize_t (*store)(struct net_bridge_port *, unsigned long);
  22 };
  23
  24 #define BRPORT_ATTR(_name,_mode,_show,_store)                   \
  25 struct brport_attribute brport_attr_##_name = {                 \
  26         .attr = {.name = __stringify(_name),                    \
  27                  .mode = _mode,                                 \
  28                  .owner = THIS_MODULE, },                       \
  29         .show   = _show,                                        \
  30         .store  = _store,                                       \
  31 };
  32
  33 static ssize_t show_path_cost(struct net_bridge_port *p, char *buf)
  34 {
  35 #if 0
  36         return sprintf(buf, "%d\n", p->path_cost);
  37 #else
  38         return sprintf(buf, "%d\n", 0);
  39 #endif
  40 }
  41 static ssize_t store_path_cost(struct net_bridge_port *p, unsigned long v)
  42 {
  43 #if 0
  44         br_stp_set_path_cost(p, v);
  45 #endif
  46         return 0;
  47 }
  48 static BRPORT_ATTR(path_cost, S_IRUGO | S_IWUSR,
  49                    show_path_cost, store_path_cost);
  50
  51 static ssize_t show_priority(struct net_bridge_port *p, char *buf)
  52 {
  53 #if 0
  54         return sprintf(buf, "%d\n", p->priority);
  55 #else
  56         return sprintf(buf, "%d\n", 0);
  57 #endif
  58 }
  59 static ssize_t store_priority(struct net_bridge_port *p, unsigned long v)
  60 {
  61 #if 0
  62         if (v >= (1<<(16-BR_PORT_BITS)))
  63                 return -ERANGE;
  64         br_stp_set_port_priority(p, v);
  65 #endif
  66         return 0;
  67 }
  68 static BRPORT_ATTR(priority, S_IRUGO | S_IWUSR,
  69                          show_priority, store_priority);
  70
  71 static ssize_t show_designated_root(struct net_bridge_port *p, char *buf)
  72 {
  73 #if 0
  74         return br_show_bridge_id(buf, &p->designated_root);
  75 #else
  76         return sprintf(buf, "0000.010203040506\n");
  77 #endif
  78 }
  79 static BRPORT_ATTR(designated_root, S_IRUGO, show_designated_root, NULL);
  80
  81 static ssize_t show_designated_bridge(struct net_bridge_port *p, char *buf)
  82 {
  83 #if 0
  84         return br_show_bridge_id(buf, &p->designated_bridge);
  85 #else
  86         return sprintf(buf, "0000.060504030201\n");
  87 #endif
  88 }
  89 static BRPORT_ATTR(designated_bridge, S_IRUGO, show_designated_bridge, NULL);
  90
  91 static ssize_t show_designated_port(struct net_bridge_port *p, char *buf)
  92 {
  93 #if 0
  94         return sprintf(buf, "%d\n", p->designated_port);
  95 #else
  96         return sprintf(buf, "%d\n", 0);
  97 #endif
  98 }
  99 static BRPORT_ATTR(designated_port, S_IRUGO, show_designated_port, NULL);
 100
 101 static ssize_t show_designated_cost(struct net_bridge_port *p, char *buf)
 102 {
 103 #if 0
 104         return sprintf(buf, "%d\n", p->designated_cost);
 105 #else
 106         return sprintf(buf, "%d\n", 0);
 107 #endif
 108 }
 109 static BRPORT_ATTR(designated_cost, S_IRUGO, show_designated_cost, NULL);
 110
 111 static ssize_t show_port_id(struct net_bridge_port *p, char *buf)
 112 {
 113 #if 0
 114         return sprintf(buf, "0x%x\n", p->port_id);
 115 #else
 116         return sprintf(buf, "0x%x\n", 0);
 117 #endif
 118 }
 119 static BRPORT_ATTR(port_id, S_IRUGO, show_port_id, NULL);
 120
 121 static ssize_t show_port_no(struct net_bridge_port *p, char *buf)
 122 {
 123         return sprintf(buf, "0x%x\n", p->port_no);
 124 }
 125
 126 static BRPORT_ATTR(port_no, S_IRUGO, show_port_no, NULL);
 127
 128 static ssize_t show_change_ack(struct net_bridge_port *p, char *buf)
 129 {
 130 #if 0
 131         return sprintf(buf, "%d\n", p->topology_change_ack);
 132 #else
 133         return sprintf(buf, "%d\n", 0);
 134 #endif
 135 }
 136 static BRPORT_ATTR(change_ack, S_IRUGO, show_change_ack, NULL);
 137
 138 static ssize_t show_config_pending(struct net_bridge_port *p, char *buf)
 139 {
 140 #if 0
 141         return sprintf(buf, "%d\n", p->config_pending);
 142 #else
 143         return sprintf(buf, "%d\n", 0);
 144 #endif
 145 }
 146 static BRPORT_ATTR(config_pending, S_IRUGO, show_config_pending, NULL);
 147
 148 static ssize_t show_port_state(struct net_bridge_port *p, char *buf)
 149 {
 150 #if 0
 151         return sprintf(buf, "%d\n", p->state);
 152 #else
 153         return sprintf(buf, "%d\n", 0);
 154 #endif
 155 }
 156 static BRPORT_ATTR(state, S_IRUGO, show_port_state, NULL);
 157
 158 static ssize_t show_message_age_timer(struct net_bridge_port *p,
 159                                             char *buf)
 160 {
 161 #if 0
 162         return sprintf(buf, "%ld\n", br_timer_value(&p->message_age_timer));
 163 #else
 164         return sprintf(buf, "%d\n", 0);
 165 #endif
 166 }
 167 static BRPORT_ATTR(message_age_timer, S_IRUGO, show_message_age_timer, NULL);
 168
 169 static ssize_t show_forward_delay_timer(struct net_bridge_port *p,
 170                                             char *buf)
 171 {
 172 #if 0
 173         return sprintf(buf, "%ld\n", br_timer_value(&p->forward_delay_timer));
 174 #else
 175         return sprintf(buf, "%d\n", 0);
 176 #endif
 177 }
 178 static BRPORT_ATTR(forward_delay_timer, S_IRUGO, show_forward_delay_timer, NULL);
 179
 180 static ssize_t show_hold_timer(struct net_bridge_port *p,
 181                                             char *buf)
 182 {
 183 #if 0
 184         return sprintf(buf, "%ld\n", br_timer_value(&p->hold_timer));
 185 #else
 186         return sprintf(buf, "%d\n", 0);
 187 #endif
 188 }
 189 static BRPORT_ATTR(hold_timer, S_IRUGO, show_hold_timer, NULL);
 190
 191 static struct brport_attribute *brport_attrs[] = {
 192         &brport_attr_path_cost,
 193         &brport_attr_priority,
 194         &brport_attr_port_id,
 195         &brport_attr_port_no,
 196         &brport_attr_designated_root,
 197         &brport_attr_designated_bridge,
 198         &brport_attr_designated_port,
 199         &brport_attr_designated_cost,
 200         &brport_attr_state,
 201         &brport_attr_change_ack,
 202         &brport_attr_config_pending,
 203         &brport_attr_message_age_timer,
 204         &brport_attr_forward_delay_timer,
 205         &brport_attr_hold_timer,
 206         NULL
 207 };
 208
 209 #define to_brport_attr(_at) container_of(_at, struct brport_attribute, attr)
 210 #define to_brport(obj)  container_of(obj, struct net_bridge_port, kobj)
 211
 212 static ssize_t brport_show(struct kobject * kobj,
 213                            struct attribute * attr, char * buf)
 214 {
 215         struct brport_attribute * brport_attr = to_brport_attr(attr);
 216         struct net_bridge_port * p = to_brport(kobj);
 217
 218         return brport_attr->show(p, buf);
 219 }
 220
 221 static ssize_t brport_store(struct kobject * kobj,
 222                             struct attribute * attr,
 223                             const char * buf, size_t count)
 224 {
 225         struct net_bridge_port * p = to_brport(kobj);
 226 #if 0
 227         struct brport_attribute * brport_attr = to_brport_attr(attr);
 228         char *endp;
 229         unsigned long val;
 230 #endif
 231         ssize_t ret = -EINVAL;
 232
 233         if (!capable(CAP_NET_ADMIN))
 234                 return -EPERM;
 235
 236 #if 0
 237         val = simple_strtoul(buf, &endp, 0);
 238         if (endp != buf) {
 239                 rtnl_lock();
 240                 if (p->dev && p->br && brport_attr->store) {
 241                         spin_lock_bh(&p->br->lock);
 242                         ret = brport_attr->store(p, val);
 243                         spin_unlock_bh(&p->br->lock);
 244                         if (ret == 0)
 245                                 ret = count;
 246                 }
 247                 rtnl_unlock();
 248         }
 249 #else
 250         printk("%s: xxx writing port parms not supported yet!\n",
 251                dp_name(p->dp));
 252 #endif
 253         return ret;
 254 }
 255
 256 struct sysfs_ops brport_sysfs_ops = {
 257         .show = brport_show,
 258         .store = brport_store,
 259 };
 260
 261 static void release_nbp(struct kobject *kobj)
 262 {
 263         struct net_bridge_port *p
 264                 = container_of(kobj, struct net_bridge_port, kobj);
 265         kfree(p);
 266 }
 267
 268 struct kobj_type brport_ktype = {
 269         .sysfs_ops = &brport_sysfs_ops,
 270         .release = release_nbp
 271 };
 272
 273 /*
 274  * Add sysfs entries to ethernet device added to a bridge.
 275  * Creates a brport subdirectory with bridge attributes.
 276  * Puts symlink in bridge's brport subdirectory
 277  */
 278 int brc_sysfs_add_if(struct net_bridge_port *p)
 279 {
 280         struct datapath *dp = p->dp;
 281         struct brport_attribute **a;
 282         int err;
 283
 284         kobject_init(&p->kobj);
 285         kobject_set_name(&p->kobj, SYSFS_BRIDGE_PORT_ATTR);
 286         p->kobj.ktype = &brport_ktype;
 287         p->kobj.kset = NULL;
 288         p->kobj.parent = &(p->dev->class_dev.kobj);
 289
 290         err = kobject_add(&p->kobj);
 291         if (err)
 292                 goto err_put;
 293
 294         err = sysfs_create_link(&p->kobj,
 295                                 &dp->ports[ODPP_LOCAL]->dev->class_dev.kobj,
 296                                 SYSFS_BRIDGE_PORT_LINK);
 297         if (err)
 298                 goto err_del;
 299
 300         for (a = brport_attrs; *a; ++a) {
 301                 err = sysfs_create_file(&p->kobj, &((*a)->attr));
 302                 if (err)
 303                         goto err_del;
 304         }
 305
 306         err = sysfs_create_link(&dp->ifobj, &p->kobj, p->dev->name);
 307         if (err)
 308                 goto err_del;
 309
 310         kobject_uevent(&p->kobj, KOBJ_ADD);
 311
 312         return err;
 313
 314 err_del:
 315         kobject_del(&p->kobj);
 316 err_put:
 317         kobject_put(&p->kobj);
 318         return err;
 319 }
 320
 321 int brc_sysfs_del_if(struct net_bridge_port *p)
 322 {
 323         struct net_device *dev = p->dev;
 324
 325         kobject_uevent(&p->kobj, KOBJ_REMOVE);
 326         kobject_del(&p->kobj);
 327
 328         dev_put(dev);
 329
 330         kobject_put(&p->kobj);
 331
 332         return 0;
 333 }
 334 #endif /* SUPPORT_SYSFS */