datapath/dp_sysfs_if.c

   1 /*
   2  * Copyright (c) 2009, 2010 Nicira Networks.
   3  * Distributed under the terms of the GNU GPL version 2.
   4  *
   5  * Significant portions of this file may be copied from parts of the Linux
   6  * kernel, by Linus Torvalds and others.
   7  */
   8
   9 /*
  10  *      Sysfs attributes of bridge ports for Open vSwitch
  11  *
  12  *  This has been shamelessly copied from the kernel sources.
  13  */
  14
  15 #include <linux/capability.h>
  16 #include <linux/kernel.h>
  17 #include <linux/netdevice.h>
  18 #include <linux/if_bridge.h>
  19 #include <linux/rtnetlink.h>
  20 #include <linux/spinlock.h>
  21
  22 #include "datapath.h"
  23 #include "dp_sysfs.h"
  24 #include "vport.h"
  25
  26 #ifdef CONFIG_SYSFS
  27
  28 struct brport_attribute {
  29         struct attribute        attr;
  30         ssize_t (*show)(struct dp_port *, char *);
  31         ssize_t (*store)(struct dp_port *, unsigned long);
  32 };
  33
  34 #define BRPORT_ATTR(_name,_mode,_show,_store)                   \
  35 struct brport_attribute brport_attr_##_name = {                 \
  36         .attr = {.name = __stringify(_name),                    \
  37                  .mode = _mode,                                 \
  38                  .owner = THIS_MODULE, },                       \
  39         .show   = _show,                                        \
  40         .store  = _store,                                       \
  41 };
  42
  43 static ssize_t show_path_cost(struct dp_port *p, char *buf)
  44 {
  45 #if 0
  46         return sprintf(buf, "%d\n", p->path_cost);
  47 #else
  48         return sprintf(buf, "%d\n", 0);
  49 #endif
  50 }
  51 static ssize_t store_path_cost(struct dp_port *p, unsigned long v)
  52 {
  53 #if 0
  54         br_stp_set_path_cost(p, v);
  55 #endif
  56         return 0;
  57 }
  58 static BRPORT_ATTR(path_cost, S_IRUGO | S_IWUSR,
  59                    show_path_cost, store_path_cost);
  60
  61 static ssize_t show_priority(struct dp_port *p, char *buf)
  62 {
  63 #if 0
  64         return sprintf(buf, "%d\n", p->priority);
  65 #else
  66         return sprintf(buf, "%d\n", 0);
  67 #endif
  68 }
  69 static ssize_t store_priority(struct dp_port *p, unsigned long v)
  70 {
  71 #if 0
  72         if (v >= (1<<(16-BR_PORT_BITS)))
  73                 return -ERANGE;
  74         br_stp_set_port_priority(p, v);
  75 #endif
  76         return 0;
  77 }
  78 static BRPORT_ATTR(priority, S_IRUGO | S_IWUSR,
  79                          show_priority, store_priority);
  80
  81 static ssize_t show_designated_root(struct dp_port *p, char *buf)
  82 {
  83 #if 0
  84         return br_show_bridge_id(buf, &p->designated_root);
  85 #else
  86         return sprintf(buf, "0000.010203040506\n");
  87 #endif
  88 }
  89 static BRPORT_ATTR(designated_root, S_IRUGO, show_designated_root, NULL);
  90
  91 static ssize_t show_designated_bridge(struct dp_port *p, char *buf)
  92 {
  93 #if 0
  94         return br_show_bridge_id(buf, &p->designated_bridge);
  95 #else
  96         return sprintf(buf, "0000.060504030201\n");
  97 #endif
  98 }
  99 static BRPORT_ATTR(designated_bridge, S_IRUGO, show_designated_bridge, NULL);
 100
 101 static ssize_t show_designated_port(struct dp_port *p, char *buf)
 102 {
 103 #if 0
 104         return sprintf(buf, "%d\n", p->designated_port);
 105 #else
 106         return sprintf(buf, "%d\n", 0);
 107 #endif
 108 }
 109 static BRPORT_ATTR(designated_port, S_IRUGO, show_designated_port, NULL);
 110
 111 static ssize_t show_designated_cost(struct dp_port *p, char *buf)
 112 {
 113 #if 0
 114         return sprintf(buf, "%d\n", p->designated_cost);
 115 #else
 116         return sprintf(buf, "%d\n", 0);
 117 #endif
 118 }
 119 static BRPORT_ATTR(designated_cost, S_IRUGO, show_designated_cost, NULL);
 120
 121 static ssize_t show_port_id(struct dp_port *p, char *buf)
 122 {
 123 #if 0
 124         return sprintf(buf, "0x%x\n", p->port_id);
 125 #else
 126         return sprintf(buf, "0x%x\n", 0);
 127 #endif
 128 }
 129 static BRPORT_ATTR(port_id, S_IRUGO, show_port_id, NULL);
 130
 131 static ssize_t show_port_no(struct dp_port *p, char *buf)
 132 {
 133         return sprintf(buf, "0x%x\n", p->port_no);
 134 }
 135
 136 static BRPORT_ATTR(port_no, S_IRUGO, show_port_no, NULL);
 137
 138 static ssize_t show_change_ack(struct dp_port *p, char *buf)
 139 {
 140 #if 0
 141         return sprintf(buf, "%d\n", p->topology_change_ack);
 142 #else
 143         return sprintf(buf, "%d\n", 0);
 144 #endif
 145 }
 146 static BRPORT_ATTR(change_ack, S_IRUGO, show_change_ack, NULL);
 147
 148 static ssize_t show_config_pending(struct dp_port *p, char *buf)
 149 {
 150 #if 0
 151         return sprintf(buf, "%d\n", p->config_pending);
 152 #else
 153         return sprintf(buf, "%d\n", 0);
 154 #endif
 155 }
 156 static BRPORT_ATTR(config_pending, S_IRUGO, show_config_pending, NULL);
 157
 158 static ssize_t show_port_state(struct dp_port *p, char *buf)
 159 {
 160 #if 0
 161         return sprintf(buf, "%d\n", p->state);
 162 #else
 163         return sprintf(buf, "%d\n", 0);
 164 #endif
 165 }
 166 static BRPORT_ATTR(state, S_IRUGO, show_port_state, NULL);
 167
 168 static ssize_t show_message_age_timer(struct dp_port *p,
 169                                             char *buf)
 170 {
 171 #if 0
 172         return sprintf(buf, "%ld\n", br_timer_value(&p->message_age_timer));
 173 #else
 174         return sprintf(buf, "%d\n", 0);
 175 #endif
 176 }
 177 static BRPORT_ATTR(message_age_timer, S_IRUGO, show_message_age_timer, NULL);
 178
 179 static ssize_t show_forward_delay_timer(struct dp_port *p,
 180                                             char *buf)
 181 {
 182 #if 0
 183         return sprintf(buf, "%ld\n", br_timer_value(&p->forward_delay_timer));
 184 #else
 185         return sprintf(buf, "%d\n", 0);
 186 #endif
 187 }
 188 static BRPORT_ATTR(forward_delay_timer, S_IRUGO, show_forward_delay_timer, NULL);
 189
 190 static ssize_t show_hold_timer(struct dp_port *p,
 191                                             char *buf)
 192 {
 193 #if 0
 194         return sprintf(buf, "%ld\n", br_timer_value(&p->hold_timer));
 195 #else
 196         return sprintf(buf, "%d\n", 0);
 197 #endif
 198 }
 199 static BRPORT_ATTR(hold_timer, S_IRUGO, show_hold_timer, NULL);
 200
 201 static struct brport_attribute *brport_attrs[] = {
 202         &brport_attr_path_cost,
 203         &brport_attr_priority,
 204         &brport_attr_port_id,
 205         &brport_attr_port_no,
 206         &brport_attr_designated_root,
 207         &brport_attr_designated_bridge,
 208         &brport_attr_designated_port,
 209         &brport_attr_designated_cost,
 210         &brport_attr_state,
 211         &brport_attr_change_ack,
 212         &brport_attr_config_pending,
 213         &brport_attr_message_age_timer,
 214         &brport_attr_forward_delay_timer,
 215         &brport_attr_hold_timer,
 216         NULL
 217 };
 218
 219 #define to_brport_attr(_at) container_of(_at, struct brport_attribute, attr)
 220 #define to_brport(obj)  container_of(obj, struct dp_port, kobj)
 221
 222 static ssize_t brport_show(struct kobject * kobj,
 223                            struct attribute * attr, char * buf)
 224 {
 225         struct brport_attribute * brport_attr = to_brport_attr(attr);
 226         struct dp_port * p = to_brport(kobj);
 227
 228         return brport_attr->show(p, buf);
 229 }
 230
 231 static ssize_t brport_store(struct kobject * kobj,
 232                             struct attribute * attr,
 233                             const char * buf, size_t count)
 234 {
 235         struct dp_port * p = to_brport(kobj);
 236 #if 0
 237         struct brport_attribute * brport_attr = to_brport_attr(attr);
 238         char *endp;
 239         unsigned long val;
 240 #endif
 241         ssize_t ret = -EINVAL;
 242
 243         if (!capable(CAP_NET_ADMIN))
 244                 return -EPERM;
 245
 246 #if 0
 247         val = simple_strtoul(buf, &endp, 0);
 248         if (endp != buf) {
 249                 rtnl_lock();
 250                 if (p->dev && p->br && brport_attr->store) {
 251                         spin_lock_bh(&p->br->lock);
 252                         ret = brport_attr->store(p, val);
 253                         spin_unlock_bh(&p->br->lock);
 254                         if (ret == 0)
 255                                 ret = count;
 256                 }
 257                 rtnl_unlock();
 258         }
 259 #else
 260         printk("%s: xxx writing port parms not supported yet!\n",
 261                dp_name(p->dp));
 262 #endif
 263         return ret;
 264 }
 265
 266 struct sysfs_ops brport_sysfs_ops = {
 267         .show = brport_show,
 268         .store = brport_store,
 269 };
 270
 271 /*
 272  * Add sysfs entries to ethernet device added to a bridge.
 273  * Creates a brport subdirectory with bridge attributes.
 274  * Puts symlink in bridge's brport subdirectory
 275  */
 276 int dp_sysfs_add_if(struct dp_port *p)
 277 {
 278         struct kobject *kobj = vport_get_kobj(p->vport);
 279         struct datapath *dp = p->dp;
 280         struct brport_attribute **a;
 281         int err;
 282
 283         /* Create /sys/class/net/<devname>/brport directory. */
 284         if (!kobj)
 285                 return -ENOENT;
 286
 287         err = kobject_add(&p->kobj, kobj, SYSFS_BRIDGE_PORT_ATTR);
 288         if (err)
 289                 goto err;
 290
 291         /* Create symlink from /sys/class/net/<devname>/brport/bridge to
 292          * /sys/class/net/<bridgename>. */
 293         err = sysfs_create_link(&p->kobj, vport_get_kobj(dp->ports[ODPP_LOCAL]->vport),
 294                                 SYSFS_BRIDGE_PORT_LINK); /* "bridge" */
 295         if (err)
 296                 goto err_del;
 297
 298         /* Populate /sys/class/net/<devname>/brport directory with files. */
 299         for (a = brport_attrs; *a; ++a) {
 300                 err = sysfs_create_file(&p->kobj, &((*a)->attr));
 301                 if (err)
 302                         goto err_del;
 303         }
 304
 305         /* Create symlink from /sys/class/net/<bridgename>/brif/<devname> to
 306          * /sys/class/net/<devname>/brport.  */
 307         err = sysfs_create_link(&dp->ifobj, &p->kobj, vport_get_name(p->vport));
 308         if (err)
 309                 goto err_del;
 310         strcpy(p->linkname, vport_get_name(p->vport));
 311
 312         kobject_uevent(&p->kobj, KOBJ_ADD);
 313
 314         return 0;
 315
 316 err_del:
 317         kobject_del(&p->kobj);
 318 err:
 319         p->linkname[0] = 0;
 320         return err;
 321 }
 322
 323 int dp_sysfs_del_if(struct dp_port *p)
 324 {
 325         if (p->linkname[0]) {
 326                 sysfs_remove_link(&p->dp->ifobj, p->linkname);
 327                 kobject_uevent(&p->kobj, KOBJ_REMOVE);
 328                 kobject_del(&p->kobj);
 329                 p->linkname[0] = '\0';
 330         }
 331         return 0;
 332 }
 333 #endif /* CONFIG_SYSFS */