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/slab.h>
  37 #include <linux/seq_file.h>
  38
  39 #include <asm/uaccess.h>
  40
  41 #include "ipoib.h"
  42
  43 static ssize_t show_parent(struct device *d, struct device_attribute *attr,
  44                            char *buf)
  45 {
  46         struct net_device *dev = to_net_dev(d);
  47         struct ipoib_dev_priv *priv = netdev_priv(dev);
  48
  49         return sprintf(buf, "%s\n", priv->parent->name);
  50 }
  51 static DEVICE_ATTR(parent, S_IRUGO, show_parent, NULL);
  52
  53 int ipoib_vlan_add(struct net_device *pdev, unsigned short pkey)
  54 {
  55         struct ipoib_dev_priv *ppriv, *priv;
  56         char intf_name[IFNAMSIZ];
  57         int result;
  58
  59         if (!capable(CAP_NET_ADMIN))
  60                 return -EPERM;
  61
  62         ppriv = netdev_priv(pdev);
  63
  64         if (!rtnl_trylock())
  65                 return restart_syscall();
  66         mutex_lock(&ppriv->vlan_mutex);
  67
  68         /*
  69          * First ensure this isn't a duplicate. We check the parent device and
  70          * then all of the child interfaces to make sure the Pkey doesn't match.
  71          */
  72         if (ppriv->pkey == pkey) {
  73                 result = -ENOTUNIQ;
  74                 priv = NULL;
  75                 goto err;
  76         }
  77
  78         list_for_each_entry(priv, &ppriv->child_intfs, list) {
  79                 if (priv->pkey == pkey) {
  80                         result = -ENOTUNIQ;
  81                         priv = NULL;
  82                         goto err;
  83                 }
  84         }
  85
  86         snprintf(intf_name, sizeof intf_name, "%s.%04x",
  87                  ppriv->dev->name, pkey);
  88         priv = ipoib_intf_alloc(intf_name);
  89         if (!priv) {
  90                 result = -ENOMEM;
  91                 goto err;
  92         }
  93
  94         priv->max_ib_mtu = ppriv->max_ib_mtu;
  95         /* MTU will be reset when mcast join happens */
  96         priv->dev->mtu   = IPOIB_UD_MTU(priv->max_ib_mtu);
  97         priv->mcast_mtu  = priv->admin_mtu = priv->dev->mtu;
  98         set_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags);
  99
 100         result = ipoib_set_dev_features(priv, ppriv->ca);
 101         if (result)
 102                 goto err;
 103
 104         priv->pkey = pkey;
 105
 106         memcpy(priv->dev->dev_addr, ppriv->dev->dev_addr, INFINIBAND_ALEN);
 107         priv->dev->broadcast[8] = pkey >> 8;
 108         priv->dev->broadcast[9] = pkey & 0xff;
 109
 110         result = ipoib_dev_init(priv->dev, ppriv->ca, ppriv->port);
 111         if (result < 0) {
 112                 ipoib_warn(ppriv, "failed to initialize subinterface: "
 113                            "device %s, port %d",
 114                            ppriv->ca->name, ppriv->port);
 115                 goto err;
 116         }
 117
 118         result = register_netdevice(priv->dev);
 119         if (result) {
 120                 ipoib_warn(priv, "failed to initialize; error %i", result);
 121                 goto register_failed;
 122         }
 123
 124         priv->parent = ppriv->dev;
 125
 126         ipoib_create_debug_files(priv->dev);
 127
 128         if (ipoib_cm_add_mode_attr(priv->dev))
 129                 goto sysfs_failed;
 130         if (ipoib_add_pkey_attr(priv->dev))
 131                 goto sysfs_failed;
 132         if (ipoib_add_umcast_attr(priv->dev))
 133                 goto sysfs_failed;
 134
 135         if (device_create_file(&priv->dev->dev, &dev_attr_parent))
 136                 goto sysfs_failed;
 137
 138         list_add_tail(&priv->list, &ppriv->child_intfs);
 139
 140         mutex_unlock(&ppriv->vlan_mutex);
 141         rtnl_unlock();
 142
 143         return 0;
 144
 145 sysfs_failed:
 146         ipoib_delete_debug_files(priv->dev);
 147         unregister_netdevice(priv->dev);
 148
 149 register_failed:
 150         ipoib_dev_cleanup(priv->dev);
 151
 152 err:
 153         mutex_unlock(&ppriv->vlan_mutex);
 154         rtnl_unlock();
 155         if (priv)
 156                 free_netdev(priv->dev);
 157
 158         return result;
 159 }
 160
 161 int ipoib_vlan_delete(struct net_device *pdev, unsigned short pkey)
 162 {
 163         struct ipoib_dev_priv *ppriv, *priv, *tpriv;
 164         struct net_device *dev = NULL;
 165
 166         if (!capable(CAP_NET_ADMIN))
 167                 return -EPERM;
 168
 169         ppriv = netdev_priv(pdev);
 170
 171         if (!rtnl_trylock())
 172                 return restart_syscall();
 173         mutex_lock(&ppriv->vlan_mutex);
 174         list_for_each_entry_safe(priv, tpriv, &ppriv->child_intfs, list) {
 175                 if (priv->pkey == pkey) {
 176                         unregister_netdevice(priv->dev);
 177                         ipoib_dev_cleanup(priv->dev);
 178                         list_del(&priv->list);
 179                         dev = priv->dev;
 180                         break;
 181                 }
 182         }
 183         mutex_unlock(&ppriv->vlan_mutex);
 184         rtnl_unlock();
 185
 186         if (dev) {
 187                 free_netdev(dev);
 188                 return 0;
 189         }
 190
 191         return -ENODEV;
 192 }