drivers/infiniband/ulp/ipoib/ipoib_vlan.c

   1 /*
   2  * Copyright (c) 2004 Topspin Communications.  All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  */
  32
  33 #include <linux/module.h>
  34
  35 #include <linux/init.h>
  36 #include <linux/seq_file.h>
  37
  38 #include <asm/uaccess.h>
  39
  40 #include "ipoib.h"
  41
  42 static ssize_t show_parent(struct device *d, struct device_attribute *attr,
  43                            char *buf)
  44 {
  45         struct net_device *dev = to_net_dev(d);
  46         struct ipoib_dev_priv *priv = netdev_priv(dev);
  47
  48         return sprintf(buf, "%s\n", priv->parent->name);
  49 }
  50 static DEVICE_ATTR(parent, S_IRUGO, show_parent, NULL);
  51
  52 int __ipoib_vlan_add(struct ipoib_dev_priv *ppriv, struct ipoib_dev_priv *priv,
  53                      u16 pkey, int type)
  54 {
  55         int result;
  56
  57         priv->max_ib_mtu = ppriv->max_ib_mtu;
  58         /* MTU will be reset when mcast join happens */
  59         priv->dev->mtu   = IPOIB_UD_MTU(priv->max_ib_mtu);
  60         priv->mcast_mtu  = priv->admin_mtu = priv->dev->mtu;
  61         priv->parent = ppriv->dev;
  62         set_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags);
  63
  64         result = ipoib_set_dev_features(priv, ppriv->ca);
  65         if (result)
  66                 goto err;
  67
  68         priv->pkey = pkey;
  69
  70         memcpy(priv->dev->dev_addr, ppriv->dev->dev_addr, INFINIBAND_ALEN);
  71         priv->dev->broadcast[8] = pkey >> 8;
  72         priv->dev->broadcast[9] = pkey & 0xff;
  73
  74         result = ipoib_dev_init(priv->dev, ppriv->ca, ppriv->port);
  75         if (result < 0) {
  76                 ipoib_warn(ppriv, "failed to initialize subinterface: "
  77                            "device %s, port %d",
  78                            ppriv->ca->name, ppriv->port);
  79                 goto err;
  80         }
  81
  82         result = register_netdevice(priv->dev);
  83         if (result) {
  84                 ipoib_warn(priv, "failed to initialize; error %i", result);
  85                 goto register_failed;
  86         }
  87
  88         ipoib_create_debug_files(priv->dev);
  89
  90         /* RTNL childs don't need proprietary sysfs entries */
  91         if (type == IPOIB_LEGACY_CHILD) {
  92                 if (ipoib_cm_add_mode_attr(priv->dev))
  93                         goto sysfs_failed;
  94                 if (ipoib_add_pkey_attr(priv->dev))
  95                         goto sysfs_failed;
  96                 if (ipoib_add_umcast_attr(priv->dev))
  97                         goto sysfs_failed;
  98
  99                 if (device_create_file(&priv->dev->dev, &dev_attr_parent))
 100                         goto sysfs_failed;
 101         }
 102
 103         priv->child_type  = type;
 104         list_add_tail(&priv->list, &ppriv->child_intfs);
 105
 106         return 0;
 107
 108 sysfs_failed:
 109         result = -ENOMEM;
 110         ipoib_delete_debug_files(priv->dev);
 111         unregister_netdevice(priv->dev);
 112
 113 register_failed:
 114         ipoib_dev_cleanup(priv->dev);
 115
 116 err:
 117         return result;
 118 }
 119
 120 int ipoib_vlan_add(struct net_device *pdev, unsigned short pkey)
 121 {
 122         struct ipoib_dev_priv *ppriv, *priv;
 123         char intf_name[IFNAMSIZ];
 124         struct ipoib_dev_priv *tpriv;
 125         int result;
 126
 127         if (!capable(CAP_NET_ADMIN))
 128                 return -EPERM;
 129
 130         ppriv = netdev_priv(pdev);
 131
 132         snprintf(intf_name, sizeof intf_name, "%s.%04x",
 133                  ppriv->dev->name, pkey);
 134         priv = ipoib_intf_alloc(intf_name);
 135         if (!priv)
 136                 return -ENOMEM;
 137
 138         if (!rtnl_trylock())
 139                 return restart_syscall();
 140
 141         down_write(&ppriv->vlan_rwsem);
 142
 143         /*
 144          * First ensure this isn't a duplicate. We check the parent device and
 145          * then all of the legacy child interfaces to make sure the Pkey
 146          * doesn't match.
 147          */
 148         if (ppriv->pkey == pkey) {
 149                 result = -ENOTUNIQ;
 150                 goto out;
 151         }
 152
 153         list_for_each_entry(tpriv, &ppriv->child_intfs, list) {
 154                 if (tpriv->pkey == pkey &&
 155                     tpriv->child_type == IPOIB_LEGACY_CHILD) {
 156                         result = -ENOTUNIQ;
 157                         goto out;
 158                 }
 159         }
 160
 161         result = __ipoib_vlan_add(ppriv, priv, pkey, IPOIB_LEGACY_CHILD);
 162
 163 out:
 164         up_write(&ppriv->vlan_rwsem);
 165
 166         if (result)
 167                 free_netdev(priv->dev);
 168
 169         rtnl_unlock();
 170
 171         return result;
 172 }
 173
 174 int ipoib_vlan_delete(struct net_device *pdev, unsigned short pkey)
 175 {
 176         struct ipoib_dev_priv *ppriv, *priv, *tpriv;
 177         struct net_device *dev = NULL;
 178
 179         if (!capable(CAP_NET_ADMIN))
 180                 return -EPERM;
 181
 182         ppriv = netdev_priv(pdev);
 183
 184         if (!rtnl_trylock())
 185                 return restart_syscall();
 186
 187         down_write(&ppriv->vlan_rwsem);
 188         list_for_each_entry_safe(priv, tpriv, &ppriv->child_intfs, list) {
 189                 if (priv->pkey == pkey &&
 190                     priv->child_type == IPOIB_LEGACY_CHILD) {
 191                         unregister_netdevice(priv->dev);
 192                         list_del(&priv->list);
 193                         dev = priv->dev;
 194                         break;
 195                 }
 196         }
 197         up_write(&ppriv->vlan_rwsem);
 198
 199         rtnl_unlock();
 200
 201         if (dev) {
 202                 free_netdev(dev);
 203                 return 0;
 204         }
 205
 206         return -ENODEV;
 207 }