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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  16
  17 #include <linux/capability.h>
  18 #include <linux/kernel.h>
  19 #include <linux/netdevice.h>
  20 #include <linux/if_bridge.h>
  21 #include <linux/rtnetlink.h>
  22
  23 #include "datapath.h"
  24 #include "dp_sysfs.h"
  25 #include "vport.h"
  26
  27 #ifdef CONFIG_SYSFS
  28
  29 struct brport_attribute {
  30         struct attribute        attr;
  31         ssize_t (*show)(struct vport *, char *);
  32         ssize_t (*store)(struct vport *, unsigned long);
  33 };
  34
  35 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36)
  36 #define BRPORT_ATTR(_name, _mode, _show, _store)                \
  37 struct brport_attribute brport_attr_##_name = {                 \
  38         .attr = {.name = __stringify(_name),                    \
  39                  .mode = _mode },                               \
  40         .show   = _show,                                        \
  41         .store  = _store,                                       \
  42 };
  43 #else
  44 #define BRPORT_ATTR(_name, _mode, _show, _store)                \
  45 struct brport_attribute brport_attr_##_name = {                 \
  46         .attr = {.name = __stringify(_name),                    \
  47                  .mode = _mode,                                 \
  48                  .owner = THIS_MODULE, },                       \
  49         .show   = _show,                                        \
  50         .store  = _store,                                       \
  51 };
  52 #endif
  53
  54 static ssize_t show_path_cost(struct vport *p, char *buf)
  55 {
  56         return sprintf(buf, "%d\n", 0);
  57 }
  58 static ssize_t store_path_cost(struct vport *p, unsigned long v)
  59 {
  60         return 0;
  61 }
  62 static BRPORT_ATTR(path_cost, S_IRUGO | S_IWUSR,
  63                    show_path_cost, store_path_cost);
  64
  65 static ssize_t show_priority(struct vport *p, char *buf)
  66 {
  67         return sprintf(buf, "%d\n", 0);
  68 }
  69 static ssize_t store_priority(struct vport *p, unsigned long v)
  70 {
  71         return 0;
  72 }
  73 static BRPORT_ATTR(priority, S_IRUGO | S_IWUSR,
  74                          show_priority, store_priority);
  75
  76 static ssize_t show_designated_root(struct vport *p, char *buf)
  77 {
  78         return sprintf(buf, "0000.010203040506\n");
  79 }
  80 static BRPORT_ATTR(designated_root, S_IRUGO, show_designated_root, NULL);
  81
  82 static ssize_t show_designated_bridge(struct vport *p, char *buf)
  83 {
  84         return sprintf(buf, "0000.060504030201\n");
  85 }
  86 static BRPORT_ATTR(designated_bridge, S_IRUGO, show_designated_bridge, NULL);
  87
  88 static ssize_t show_designated_port(struct vport *p, char *buf)
  89 {
  90         return sprintf(buf, "%d\n", 0);
  91 }
  92 static BRPORT_ATTR(designated_port, S_IRUGO, show_designated_port, NULL);
  93
  94 static ssize_t show_designated_cost(struct vport *p, char *buf)
  95 {
  96         return sprintf(buf, "%d\n", 0);
  97 }
  98 static BRPORT_ATTR(designated_cost, S_IRUGO, show_designated_cost, NULL);
  99
 100 static ssize_t show_port_id(struct vport *p, char *buf)
 101 {
 102         return sprintf(buf, "0x%x\n", 0);
 103 }
 104 static BRPORT_ATTR(port_id, S_IRUGO, show_port_id, NULL);
 105
 106 static ssize_t show_port_no(struct vport *p, char *buf)
 107 {
 108         return sprintf(buf, "0x%x\n", p->port_no);
 109 }
 110
 111 static BRPORT_ATTR(port_no, S_IRUGO, show_port_no, NULL);
 112
 113 static ssize_t show_change_ack(struct vport *p, char *buf)
 114 {
 115         return sprintf(buf, "%d\n", 0);
 116 }
 117 static BRPORT_ATTR(change_ack, S_IRUGO, show_change_ack, NULL);
 118
 119 static ssize_t show_config_pending(struct vport *p, char *buf)
 120 {
 121         return sprintf(buf, "%d\n", 0);
 122 }
 123 static BRPORT_ATTR(config_pending, S_IRUGO, show_config_pending, NULL);
 124
 125 static ssize_t show_port_state(struct vport *p, char *buf)
 126 {
 127         return sprintf(buf, "%d\n", 0);
 128 }
 129 static BRPORT_ATTR(state, S_IRUGO, show_port_state, NULL);
 130
 131 static ssize_t show_message_age_timer(struct vport *p, char *buf)
 132 {
 133         return sprintf(buf, "%d\n", 0);
 134 }
 135 static BRPORT_ATTR(message_age_timer, S_IRUGO, show_message_age_timer, NULL);
 136
 137 static ssize_t show_forward_delay_timer(struct vport *p, 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, char *buf)
 144 {
 145         return sprintf(buf, "%d\n", 0);
 146 }
 147 static BRPORT_ATTR(hold_timer, S_IRUGO, show_hold_timer, NULL);
 148
 149 static struct brport_attribute *brport_attrs[] = {
 150         &brport_attr_path_cost,
 151         &brport_attr_priority,
 152         &brport_attr_port_id,
 153         &brport_attr_port_no,
 154         &brport_attr_designated_root,
 155         &brport_attr_designated_bridge,
 156         &brport_attr_designated_port,
 157         &brport_attr_designated_cost,
 158         &brport_attr_state,
 159         &brport_attr_change_ack,
 160         &brport_attr_config_pending,
 161         &brport_attr_message_age_timer,
 162         &brport_attr_forward_delay_timer,
 163         &brport_attr_hold_timer,
 164         NULL
 165 };
 166
 167 #define to_vport_attr(_at) container_of(_at, struct brport_attribute, attr)
 168 #define to_vport(obj)   container_of(obj, struct vport, kobj)
 169
 170 static ssize_t brport_show(struct kobject *kobj,
 171                            struct attribute *attr, char *buf)
 172 {
 173         struct brport_attribute *brport_attr = to_vport_attr(attr);
 174         struct vport *p = to_vport(kobj);
 175
 176         return brport_attr->show(p, buf);
 177 }
 178
 179 static ssize_t brport_store(struct kobject *kobj,
 180                             struct attribute *attr,
 181                             const char *buf, size_t count)
 182 {
 183         struct vport *p = to_vport(kobj);
 184         ssize_t ret = -EINVAL;
 185
 186         if (!capable(CAP_NET_ADMIN))
 187                 return -EPERM;
 188
 189         pr_warning("%s: xxx writing port parms not supported yet!\n",
 190                    dp_name(p->dp));
 191
 192         return ret;
 193 }
 194
 195 const struct sysfs_ops brport_sysfs_ops = {
 196         .show = brport_show,
 197         .store = brport_store,
 198 };
 199
 200 /*
 201  * Add sysfs entries to ethernet device added to a bridge.
 202  * Creates a brport subdirectory with bridge attributes.
 203  * Puts symlink in bridge's brport subdirectory
 204  */
 205 int dp_sysfs_add_if(struct vport *p)
 206 {
 207         struct kobject *kobj = vport_get_kobj(p);
 208         struct datapath *dp = p->dp;
 209         struct brport_attribute **a;
 210         int err;
 211
 212         /* Create /sys/class/net/<devname>/brport directory. */
 213         if (!kobj)
 214                 return -ENOENT;
 215
 216         err = kobject_add(&p->kobj, kobj, SYSFS_BRIDGE_PORT_ATTR);
 217         if (err)
 218                 goto err;
 219
 220         /* Create symlink from /sys/class/net/<devname>/brport/bridge to
 221          * /sys/class/net/<bridgename>. */
 222         err = sysfs_create_link(&p->kobj,
 223                 vport_get_kobj(rtnl_dereference(dp->ports[OVSP_LOCAL])),
 224                 SYSFS_BRIDGE_PORT_LINK); /* "bridge" */
 225         if (err)
 226                 goto err_del;
 227
 228         /* Populate /sys/class/net/<devname>/brport directory with files. */
 229         for (a = brport_attrs; *a; ++a) {
 230                 err = sysfs_create_file(&p->kobj, &((*a)->attr));
 231                 if (err)
 232                         goto err_del;
 233         }
 234
 235         /* Create symlink from /sys/class/net/<bridgename>/brif/<devname> to
 236          * /sys/class/net/<devname>/brport.  */
 237         err = sysfs_create_link(&dp->ifobj, &p->kobj, vport_get_name(p));
 238         if (err)
 239                 goto err_del;
 240         strcpy(p->linkname, vport_get_name(p));
 241
 242         kobject_uevent(&p->kobj, KOBJ_ADD);
 243
 244         return 0;
 245
 246 err_del:
 247         kobject_del(&p->kobj);
 248 err:
 249         p->linkname[0] = 0;
 250         return err;
 251 }
 252
 253 int dp_sysfs_del_if(struct vport *p)
 254 {
 255         if (p->linkname[0]) {
 256                 sysfs_remove_link(&p->dp->ifobj, p->linkname);
 257                 kobject_uevent(&p->kobj, KOBJ_REMOVE);
 258                 kobject_del(&p->kobj);
 259                 p->linkname[0] = '\0';
 260         }
 261         return 0;
 262 }
 263 #endif /* CONFIG_SYSFS */