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 <linux/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         memcpy(&priv->local_gid, &ppriv->local_gid, sizeof(priv->local_gid));
  72         set_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags);
  73         priv->dev->broadcast[8] = pkey >> 8;
  74         priv->dev->broadcast[9] = pkey & 0xff;
  75
  76         result = ipoib_dev_init(priv->dev, ppriv->ca, ppriv->port);
  77         if (result < 0) {
  78                 ipoib_warn(ppriv, "failed to initialize subinterface: "
  79                            "device %s, port %d",
  80                            ppriv->ca->name, ppriv->port);
  81                 goto err;
  82         }
  83
  84         result = register_netdevice(priv->dev);
  85         if (result) {
  86                 ipoib_warn(priv, "failed to initialize; error %i", result);
  87                 goto register_failed;
  88         }
  89
  90         ipoib_create_debug_files(priv->dev);
  91
  92         /* RTNL childs don't need proprietary sysfs entries */
  93         if (type == IPOIB_LEGACY_CHILD) {
  94                 if (ipoib_cm_add_mode_attr(priv->dev))
  95                         goto sysfs_failed;
  96                 if (ipoib_add_pkey_attr(priv->dev))
  97                         goto sysfs_failed;
  98                 if (ipoib_add_umcast_attr(priv->dev))
  99                         goto sysfs_failed;
 100
 101                 if (device_create_file(&priv->dev->dev, &dev_attr_parent))
 102                         goto sysfs_failed;
 103         }
 104
 105         priv->child_type  = type;
 106         list_add_tail(&priv->list, &ppriv->child_intfs);
 107
 108         return 0;
 109
 110 sysfs_failed:
 111         result = -ENOMEM;
 112         ipoib_delete_debug_files(priv->dev);
 113         unregister_netdevice(priv->dev);
 114
 115 register_failed:
 116         ipoib_dev_cleanup(priv->dev);
 117
 118 err:
 119         return result;
 120 }
 121
 122 int ipoib_vlan_add(struct net_device *pdev, unsigned short pkey)
 123 {
 124         struct ipoib_dev_priv *ppriv, *priv;
 125         char intf_name[IFNAMSIZ];
 126         struct ipoib_dev_priv *tpriv;
 127         int result;
 128
 129         if (!capable(CAP_NET_ADMIN))
 130                 return -EPERM;
 131
 132         ppriv = netdev_priv(pdev);
 133
 134         if (test_bit(IPOIB_FLAG_GOING_DOWN, &ppriv->flags))
 135                 return -EPERM;
 136
 137         snprintf(intf_name, sizeof intf_name, "%s.%04x",
 138                  ppriv->dev->name, pkey);
 139         priv = ipoib_intf_alloc(intf_name);
 140         if (!priv)
 141                 return -ENOMEM;
 142
 143         if (!rtnl_trylock())
 144                 return restart_syscall();
 145
 146         down_write(&ppriv->vlan_rwsem);
 147
 148         /*
 149          * First ensure this isn't a duplicate. We check the parent device and
 150          * then all of the legacy child interfaces to make sure the Pkey
 151          * doesn't match.
 152          */
 153         if (ppriv->pkey == pkey) {
 154                 result = -ENOTUNIQ;
 155                 goto out;
 156         }
 157
 158         list_for_each_entry(tpriv, &ppriv->child_intfs, list) {
 159                 if (tpriv->pkey == pkey &&
 160                     tpriv->child_type == IPOIB_LEGACY_CHILD) {
 161                         result = -ENOTUNIQ;
 162                         goto out;
 163                 }
 164         }
 165
 166         result = __ipoib_vlan_add(ppriv, priv, pkey, IPOIB_LEGACY_CHILD);
 167
 168 out:
 169         up_write(&ppriv->vlan_rwsem);
 170
 171         if (result)
 172                 free_netdev(priv->dev);
 173
 174         rtnl_unlock();
 175
 176         return result;
 177 }
 178
 179 int ipoib_vlan_delete(struct net_device *pdev, unsigned short pkey)
 180 {
 181         struct ipoib_dev_priv *ppriv, *priv, *tpriv;
 182         struct net_device *dev = NULL;
 183
 184         if (!capable(CAP_NET_ADMIN))
 185                 return -EPERM;
 186
 187         ppriv = netdev_priv(pdev);
 188
 189         if (test_bit(IPOIB_FLAG_GOING_DOWN, &ppriv->flags))
 190                 return -EPERM;
 191
 192         if (!rtnl_trylock())
 193                 return restart_syscall();
 194
 195         down_write(&ppriv->vlan_rwsem);
 196         list_for_each_entry_safe(priv, tpriv, &ppriv->child_intfs, list) {
 197                 if (priv->pkey == pkey &&
 198                     priv->child_type == IPOIB_LEGACY_CHILD) {
 199                         unregister_netdevice(priv->dev);
 200                         list_del(&priv->list);
 201                         dev = priv->dev;
 202                         break;
 203                 }
 204         }
 205         up_write(&ppriv->vlan_rwsem);
 206
 207         rtnl_unlock();
 208
 209         if (dev) {
 210                 free_netdev(dev);
 211                 return 0;
 212         }
 213
 214         return -ENODEV;
 215 }