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 net_device *pdev, unsigned short pkey)
  53 {
  54         struct ipoib_dev_priv *ppriv, *priv;
  55         char intf_name[IFNAMSIZ];
  56         int result;
  57
  58         if (!capable(CAP_NET_ADMIN))
  59                 return -EPERM;
  60
  61         ppriv = netdev_priv(pdev);
  62
  63         if (!rtnl_trylock())
  64                 return restart_syscall();
  65         mutex_lock(&ppriv->vlan_mutex);
  66
  67         /*
  68          * First ensure this isn't a duplicate. We check the parent device and
  69          * then all of the child interfaces to make sure the Pkey doesn't match.
  70          */
  71         if (ppriv->pkey == pkey) {
  72                 result = -ENOTUNIQ;
  73                 priv = NULL;
  74                 goto err;
  75         }
  76
  77         list_for_each_entry(priv, &ppriv->child_intfs, list) {
  78                 if (priv->pkey == pkey) {
  79                         result = -ENOTUNIQ;
  80                         priv = NULL;
  81                         goto err;
  82                 }
  83         }
  84
  85         snprintf(intf_name, sizeof intf_name, "%s.%04x",
  86                  ppriv->dev->name, pkey);
  87         priv = ipoib_intf_alloc(intf_name);
  88         if (!priv) {
  89                 result = -ENOMEM;
  90                 goto err;
  91         }
  92
  93         priv->max_ib_mtu = ppriv->max_ib_mtu;
  94         /* MTU will be reset when mcast join happens */
  95         priv->dev->mtu   = IPOIB_UD_MTU(priv->max_ib_mtu);
  96         priv->mcast_mtu  = priv->admin_mtu = priv->dev->mtu;
  97         set_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags);
  98
  99         result = ipoib_set_dev_features(priv, ppriv->ca);
 100         if (result)
 101                 goto err;
 102
 103         priv->pkey = pkey;
 104
 105         memcpy(priv->dev->dev_addr, ppriv->dev->dev_addr, INFINIBAND_ALEN);
 106         priv->dev->broadcast[8] = pkey >> 8;
 107         priv->dev->broadcast[9] = pkey & 0xff;
 108
 109         result = ipoib_dev_init(priv->dev, ppriv->ca, ppriv->port);
 110         if (result < 0) {
 111                 ipoib_warn(ppriv, "failed to initialize subinterface: "
 112                            "device %s, port %d",
 113                            ppriv->ca->name, ppriv->port);
 114                 goto err;
 115         }
 116
 117         result = register_netdevice(priv->dev);
 118         if (result) {
 119                 ipoib_warn(priv, "failed to initialize; error %i", result);
 120                 goto register_failed;
 121         }
 122
 123         priv->parent = ppriv->dev;
 124
 125         ipoib_create_debug_files(priv->dev);
 126
 127         if (ipoib_cm_add_mode_attr(priv->dev))
 128                 goto sysfs_failed;
 129         if (ipoib_add_pkey_attr(priv->dev))
 130                 goto sysfs_failed;
 131         if (ipoib_add_umcast_attr(priv->dev))
 132                 goto sysfs_failed;
 133
 134         if (device_create_file(&priv->dev->dev, &dev_attr_parent))
 135                 goto sysfs_failed;
 136
 137         list_add_tail(&priv->list, &ppriv->child_intfs);
 138
 139         mutex_unlock(&ppriv->vlan_mutex);
 140         rtnl_unlock();
 141
 142         return 0;
 143
 144 sysfs_failed:
 145         ipoib_delete_debug_files(priv->dev);
 146         unregister_netdevice(priv->dev);
 147
 148 register_failed:
 149         ipoib_dev_cleanup(priv->dev);
 150
 151 err:
 152         mutex_unlock(&ppriv->vlan_mutex);
 153         rtnl_unlock();
 154         if (priv)
 155                 free_netdev(priv->dev);
 156
 157         return result;
 158 }
 159
 160 int ipoib_vlan_delete(struct net_device *pdev, unsigned short pkey)
 161 {
 162         struct ipoib_dev_priv *ppriv, *priv, *tpriv;
 163         struct net_device *dev = NULL;
 164
 165         if (!capable(CAP_NET_ADMIN))
 166                 return -EPERM;
 167
 168         ppriv = netdev_priv(pdev);
 169
 170         if (!rtnl_trylock())
 171                 return restart_syscall();
 172         mutex_lock(&ppriv->vlan_mutex);
 173         list_for_each_entry_safe(priv, tpriv, &ppriv->child_intfs, list) {
 174                 if (priv->pkey == pkey) {
 175                         unregister_netdevice(priv->dev);
 176                         ipoib_dev_cleanup(priv->dev);
 177                         list_del(&priv->list);
 178                         dev = priv->dev;
 179                         break;
 180                 }
 181         }
 182         mutex_unlock(&ppriv->vlan_mutex);
 183         rtnl_unlock();
 184
 185         if (dev) {
 186                 free_netdev(dev);
 187                 return 0;
 188         }
 189
 190         return -ENODEV;
 191 }