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
  21 #include "datapath.h"
  22 #include "dp_sysfs.h"
  23 #include "vport.h"
  24
  25 #ifdef CONFIG_SYSFS
  26
  27 struct brport_attribute {
  28         struct attribute        attr;
  29         ssize_t (*show)(struct vport *, char *);
  30         ssize_t (*store)(struct vport *, unsigned long);
  31 };
  32
  33 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36)
  34 #define BRPORT_ATTR(_name,_mode,_show,_store)                   \
  35 struct brport_attribute brport_attr_##_name = {                 \
  36         .attr = {.name = __stringify(_name),                    \
  37                  .mode = _mode },                               \
  38         .show   = _show,                                        \
  39         .store  = _store,                                       \
  40 };
  41 #else
  42 #define BRPORT_ATTR(_name,_mode,_show,_store)                   \
  43 struct brport_attribute brport_attr_##_name = {                 \
  44         .attr = {.name = __stringify(_name),                    \
  45                  .mode = _mode,                                 \
  46                  .owner = THIS_MODULE, },                       \
  47         .show   = _show,                                        \
  48         .store  = _store,                                       \
  49 };
  50 #endif
  51
  52 static ssize_t show_path_cost(struct vport *p, char *buf)
  53 {
  54         return sprintf(buf, "%d\n", 0);
  55 }
  56 static ssize_t store_path_cost(struct vport *p, unsigned long v)
  57 {
  58         return 0;
  59 }
  60 static BRPORT_ATTR(path_cost, S_IRUGO | S_IWUSR,
  61                    show_path_cost, store_path_cost);
  62
  63 static ssize_t show_priority(struct vport *p, char *buf)
  64 {
  65         return sprintf(buf, "%d\n", 0);
  66 }
  67 static ssize_t store_priority(struct vport *p, unsigned long v)
  68 {
  69         return 0;
  70 }
  71 static BRPORT_ATTR(priority, S_IRUGO | S_IWUSR,
  72                          show_priority, store_priority);
  73
  74 static ssize_t show_designated_root(struct vport *p, char *buf)
  75 {
  76         return sprintf(buf, "0000.010203040506\n");
  77 }
  78 static BRPORT_ATTR(designated_root, S_IRUGO, show_designated_root, NULL);
  79
  80 static ssize_t show_designated_bridge(struct vport *p, char *buf)
  81 {
  82         return sprintf(buf, "0000.060504030201\n");
  83 }
  84 static BRPORT_ATTR(designated_bridge, S_IRUGO, show_designated_bridge, NULL);
  85
  86 static ssize_t show_designated_port(struct vport *p, char *buf)
  87 {
  88         return sprintf(buf, "%d\n", 0);
  89 }
  90 static BRPORT_ATTR(designated_port, S_IRUGO, show_designated_port, NULL);
  91
  92 static ssize_t show_designated_cost(struct vport *p, char *buf)
  93 {
  94         return sprintf(buf, "%d\n", 0);
  95 }
  96 static BRPORT_ATTR(designated_cost, S_IRUGO, show_designated_cost, NULL);
  97
  98 static ssize_t show_port_id(struct vport *p, char *buf)
  99 {
 100         return sprintf(buf, "0x%x\n", 0);
 101 }
 102 static BRPORT_ATTR(port_id, S_IRUGO, show_port_id, NULL);
 103
 104 static ssize_t show_port_no(struct vport *p, char *buf)
 105 {
 106         return sprintf(buf, "0x%x\n", p->port_no);
 107 }
 108
 109 static BRPORT_ATTR(port_no, S_IRUGO, show_port_no, NULL);
 110
 111 static ssize_t show_change_ack(struct vport *p, char *buf)
 112 {
 113         return sprintf(buf, "%d\n", 0);
 114 }
 115 static BRPORT_ATTR(change_ack, S_IRUGO, show_change_ack, NULL);
 116
 117 static ssize_t show_config_pending(struct vport *p, char *buf)
 118 {
 119         return sprintf(buf, "%d\n", 0);
 120 }
 121 static BRPORT_ATTR(config_pending, S_IRUGO, show_config_pending, NULL);
 122
 123 static ssize_t show_port_state(struct vport *p, char *buf)
 124 {
 125         return sprintf(buf, "%d\n", 0);
 126 }
 127 static BRPORT_ATTR(state, S_IRUGO, show_port_state, NULL);
 128
 129 static ssize_t show_message_age_timer(struct vport *p,
 130                                             char *buf)
 131 {
 132         return sprintf(buf, "%d\n", 0);
 133 }
 134 static BRPORT_ATTR(message_age_timer, S_IRUGO, show_message_age_timer, NULL);
 135
 136 static ssize_t show_forward_delay_timer(struct vport *p,
 137                                             char *buf)
 138 {
 139         return sprintf(buf, "%d\n", 0);
 140 }
 141 static BRPORT_ATTR(forward_delay_timer, S_IRUGO, show_forward_delay_timer, NULL);
 142
 143 static ssize_t show_hold_timer(struct vport *p,
 144                                             char *buf)
 145 {
 146         return sprintf(buf, "%d\n", 0);
 147 }
 148 static BRPORT_ATTR(hold_timer, S_IRUGO, show_hold_timer, NULL);
 149
 150 static struct brport_attribute *brport_attrs[] = {
 151         &brport_attr_path_cost,
 152         &brport_attr_priority,
 153         &brport_attr_port_id,
 154         &brport_attr_port_no,
 155         &brport_attr_designated_root,
 156         &brport_attr_designated_bridge,
 157         &brport_attr_designated_port,
 158         &brport_attr_designated_cost,
 159         &brport_attr_state,
 160         &brport_attr_change_ack,
 161         &brport_attr_config_pending,
 162         &brport_attr_message_age_timer,
 163         &brport_attr_forward_delay_timer,
 164         &brport_attr_hold_timer,
 165         NULL
 166 };
 167
 168 #define to_vport_attr(_at) container_of(_at, struct brport_attribute, attr)
 169 #define to_vport(obj)   container_of(obj, struct vport, kobj)
 170
 171 static ssize_t brport_show(struct kobject * kobj,
 172                            struct attribute * attr, char * buf)
 173 {
 174         struct brport_attribute * brport_attr = to_vport_attr(attr);
 175         struct vport * p = to_vport(kobj);
 176
 177         return brport_attr->show(p, buf);
 178 }
 179
 180 static ssize_t brport_store(struct kobject * kobj,
 181                             struct attribute * attr,
 182                             const char * buf, size_t count)
 183 {
 184         struct vport * p = to_vport(kobj);
 185         ssize_t ret = -EINVAL;
 186
 187         if (!capable(CAP_NET_ADMIN))
 188                 return -EPERM;
 189
 190         printk("%s: xxx writing port parms not supported yet!\n",
 191                dp_name(p->dp));
 192
 193         return ret;
 194 }
 195
 196 struct sysfs_ops brport_sysfs_ops = {
 197         .show = brport_show,
 198         .store = brport_store,
 199 };
 200
 201 /*
 202  * Add sysfs entries to ethernet device added to a bridge.
 203  * Creates a brport subdirectory with bridge attributes.
 204  * Puts symlink in bridge's brport subdirectory
 205  */
 206 int dp_sysfs_add_if(struct vport *p)
 207 {
 208         struct kobject *kobj = vport_get_kobj(p);
 209         struct datapath *dp = p->dp;
 210         struct brport_attribute **a;
 211         int err;
 212
 213         /* Create /sys/class/net/<devname>/brport directory. */
 214         if (!kobj)
 215                 return -ENOENT;
 216
 217         err = kobject_add(&p->kobj, kobj, SYSFS_BRIDGE_PORT_ATTR);
 218         if (err)
 219                 goto err;
 220
 221         /* Create symlink from /sys/class/net/<devname>/brport/bridge to
 222          * /sys/class/net/<bridgename>. */
 223         err = sysfs_create_link(&p->kobj,
 224                 vport_get_kobj(rtnl_dereference(dp->ports[ODPP_LOCAL])),
 225                 SYSFS_BRIDGE_PORT_LINK); /* "bridge" */
 226         if (err)
 227                 goto err_del;
 228
 229         /* Populate /sys/class/net/<devname>/brport directory with files. */
 230         for (a = brport_attrs; *a; ++a) {
 231                 err = sysfs_create_file(&p->kobj, &((*a)->attr));
 232                 if (err)
 233                         goto err_del;
 234         }
 235
 236         /* Create symlink from /sys/class/net/<bridgename>/brif/<devname> to
 237          * /sys/class/net/<devname>/brport.  */
 238         err = sysfs_create_link(&dp->ifobj, &p->kobj, vport_get_name(p));
 239         if (err)
 240                 goto err_del;
 241         strcpy(p->linkname, vport_get_name(p));
 242
 243         kobject_uevent(&p->kobj, KOBJ_ADD);
 244
 245         return 0;
 246
 247 err_del:
 248         kobject_del(&p->kobj);
 249 err:
 250         p->linkname[0] = 0;
 251         return err;
 252 }
 253
 254 int dp_sysfs_del_if(struct vport *p)
 255 {
 256         if (p->linkname[0]) {
 257                 sysfs_remove_link(&p->dp->ifobj, p->linkname);
 258                 kobject_uevent(&p->kobj, KOBJ_REMOVE);
 259                 kobject_del(&p->kobj);
 260                 p->linkname[0] = '\0';
 261         }
 262         return 0;
 263 }
 264 #endif /* CONFIG_SYSFS */