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 #include <linux/sched/signal.h>
  35
  36 #include <linux/init.h>
  37 #include <linux/seq_file.h>
  38
  39 #include <linux/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 = ipoib_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 ipoib_dev_priv *ppriv, struct ipoib_dev_priv *priv,
  54                      u16 pkey, int type)
  55 {
  56         int result;
  57
  58         priv->max_ib_mtu = ppriv->max_ib_mtu;
  59         /* MTU will be reset when mcast join happens */
  60         priv->dev->mtu   = IPOIB_UD_MTU(priv->max_ib_mtu);
  61         priv->mcast_mtu  = priv->admin_mtu = priv->dev->mtu;
  62         priv->parent = ppriv->dev;
  63         set_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags);
  64
  65         ipoib_set_dev_features(priv, ppriv->ca);
  66
  67         priv->pkey = pkey;
  68
  69         memcpy(priv->dev->dev_addr, ppriv->dev->dev_addr, INFINIBAND_ALEN);
  70         memcpy(&priv->local_gid, &ppriv->local_gid, sizeof(priv->local_gid));
  71         set_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags);
  72         priv->dev->broadcast[8] = pkey >> 8;
  73         priv->dev->broadcast[9] = pkey & 0xff;
  74
  75         result = ipoib_dev_init(priv->dev, ppriv->ca, ppriv->port);
  76         if (result < 0) {
  77                 ipoib_warn(ppriv, "failed to initialize subinterface: "
  78                            "device %s, port %d",
  79                            ppriv->ca->name, ppriv->port);
  80                 goto err;
  81         }
  82
  83         result = register_netdevice(priv->dev);
  84         if (result) {
  85                 ipoib_warn(priv, "failed to initialize; error %i", result);
  86                 goto register_failed;
  87         }
  88
  89         /* RTNL childs don't need proprietary sysfs entries */
  90         if (type == IPOIB_LEGACY_CHILD) {
  91                 if (ipoib_cm_add_mode_attr(priv->dev))
  92                         goto sysfs_failed;
  93                 if (ipoib_add_pkey_attr(priv->dev))
  94                         goto sysfs_failed;
  95                 if (ipoib_add_umcast_attr(priv->dev))
  96                         goto sysfs_failed;
  97
  98                 if (device_create_file(&priv->dev->dev, &dev_attr_parent))
  99                         goto sysfs_failed;
 100         }
 101
 102         priv->child_type  = type;
 103         list_add_tail(&priv->list, &ppriv->child_intfs);
 104
 105         return 0;
 106
 107 sysfs_failed:
 108         result = -ENOMEM;
 109         unregister_netdevice(priv->dev);
 110
 111 register_failed:
 112         ipoib_dev_cleanup(priv->dev);
 113
 114 err:
 115         return result;
 116 }
 117
 118 int ipoib_vlan_add(struct net_device *pdev, unsigned short pkey)
 119 {
 120         struct ipoib_dev_priv *ppriv, *priv;
 121         char intf_name[IFNAMSIZ];
 122         struct ipoib_dev_priv *tpriv;
 123         int result;
 124
 125         if (!capable(CAP_NET_ADMIN))
 126                 return -EPERM;
 127
 128         ppriv = ipoib_priv(pdev);
 129
 130         if (test_bit(IPOIB_FLAG_GOING_DOWN, &ppriv->flags))
 131                 return -EPERM;
 132
 133         snprintf(intf_name, sizeof intf_name, "%s.%04x",
 134                  ppriv->dev->name, pkey);
 135
 136         if (!mutex_trylock(&ppriv->sysfs_mutex))
 137                 return restart_syscall();
 138
 139         if (!rtnl_trylock()) {
 140                 mutex_unlock(&ppriv->sysfs_mutex);
 141                 return restart_syscall();
 142         }
 143
 144         if (!down_write_trylock(&ppriv->vlan_rwsem)) {
 145                 rtnl_unlock();
 146                 mutex_unlock(&ppriv->sysfs_mutex);
 147                 return restart_syscall();
 148         }
 149
 150         priv = ipoib_intf_alloc(ppriv->ca, ppriv->port, intf_name);
 151         if (!priv) {
 152                 result = -ENOMEM;
 153                 goto out;
 154         }
 155
 156         /*
 157          * First ensure this isn't a duplicate. We check the parent device and
 158          * then all of the legacy child interfaces to make sure the Pkey
 159          * doesn't match.
 160          */
 161         if (ppriv->pkey == pkey) {
 162                 result = -ENOTUNIQ;
 163                 goto out;
 164         }
 165
 166         list_for_each_entry(tpriv, &ppriv->child_intfs, list) {
 167                 if (tpriv->pkey == pkey &&
 168                     tpriv->child_type == IPOIB_LEGACY_CHILD) {
 169                         result = -ENOTUNIQ;
 170                         goto out;
 171                 }
 172         }
 173
 174         result = __ipoib_vlan_add(ppriv, priv, pkey, IPOIB_LEGACY_CHILD);
 175
 176 out:
 177         up_write(&ppriv->vlan_rwsem);
 178         rtnl_unlock();
 179         mutex_unlock(&ppriv->sysfs_mutex);
 180
 181         if (result && priv) {
 182                 struct rdma_netdev *rn;
 183
 184                 rn = netdev_priv(priv->dev);
 185                 rn->free_rdma_netdev(priv->dev);
 186                 kfree(priv);
 187         }
 188
 189         return result;
 190 }
 191
 192 int ipoib_vlan_delete(struct net_device *pdev, unsigned short pkey)
 193 {
 194         struct ipoib_dev_priv *ppriv, *priv, *tpriv;
 195         struct net_device *dev = NULL;
 196
 197         if (!capable(CAP_NET_ADMIN))
 198                 return -EPERM;
 199
 200         ppriv = ipoib_priv(pdev);
 201
 202         if (test_bit(IPOIB_FLAG_GOING_DOWN, &ppriv->flags))
 203                 return -EPERM;
 204
 205         if (!mutex_trylock(&ppriv->sysfs_mutex))
 206                 return restart_syscall();
 207
 208         if (!rtnl_trylock()) {
 209                 mutex_unlock(&ppriv->sysfs_mutex);
 210                 return restart_syscall();
 211         }
 212
 213         if (!down_write_trylock(&ppriv->vlan_rwsem)) {
 214                 rtnl_unlock();
 215                 mutex_unlock(&ppriv->sysfs_mutex);
 216                 return restart_syscall();
 217         }
 218
 219         list_for_each_entry_safe(priv, tpriv, &ppriv->child_intfs, list) {
 220                 if (priv->pkey == pkey &&
 221                     priv->child_type == IPOIB_LEGACY_CHILD) {
 222                         list_del(&priv->list);
 223                         dev = priv->dev;
 224                         break;
 225                 }
 226         }
 227         up_write(&ppriv->vlan_rwsem);
 228
 229         if (dev) {
 230                 ipoib_dbg(ppriv, "delete child vlan %s\n", dev->name);
 231                 unregister_netdevice(dev);
 232         }
 233
 234         rtnl_unlock();
 235         mutex_unlock(&ppriv->sysfs_mutex);
 236
 237         if (dev) {
 238                 struct rdma_netdev *rn;
 239
 240                 rn = netdev_priv(dev);
 241                 rn->free_rdma_netdev(priv->dev);
 242                 kfree(priv);
 243                 return 0;
 244         }
 245
 246         return -ENODEV;
 247 }