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