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ipoib_vlan.c

/*
 * Copyright (c) 2004 Topspin Communications.  All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * $Id: ipoib_vlan.c 1349 2004-12-16 21:09:43Z roland $
 */

#include <linux/module.h>

#include <linux/init.h>
#include <linux/slab.h>
#include <linux/seq_file.h>

#include <asm/uaccess.h>

#include "ipoib.h"

static ssize_t show_parent(struct device *d, struct device_attribute *attr,
                     char *buf)
{
      struct net_device *dev = to_net_dev(d);
      struct ipoib_dev_priv *priv = netdev_priv(dev);

      return sprintf(buf, "%s\n", priv->parent->name);
}
static DEVICE_ATTR(parent, S_IRUGO, show_parent, NULL);

int ipoib_vlan_add(struct net_device *pdev, unsigned short pkey)
{
      struct ipoib_dev_priv *ppriv, *priv;
      char intf_name[IFNAMSIZ];
      int result;

      if (!capable(CAP_NET_ADMIN))
            return -EPERM;

      ppriv = netdev_priv(pdev);

      mutex_lock(&ppriv->vlan_mutex);

      /*
       * First ensure this isn't a duplicate. We check the parent device and
       * then all of the child interfaces to make sure the Pkey doesn't match.
       */
      if (ppriv->pkey == pkey) {
            result = -ENOTUNIQ;
            goto err;
      }

      list_for_each_entry(priv, &ppriv->child_intfs, list) {
            if (priv->pkey == pkey) {
                  result = -ENOTUNIQ;
                  goto err;
            }
      }

      snprintf(intf_name, sizeof intf_name, "%s.%04x",
             ppriv->dev->name, pkey);
      priv = ipoib_intf_alloc(intf_name);
      if (!priv) {
            result = -ENOMEM;
            goto err;
      }

      set_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags);

      priv->pkey = pkey;

      memcpy(priv->dev->dev_addr, ppriv->dev->dev_addr, INFINIBAND_ALEN);
      priv->dev->broadcast[8] = pkey >> 8;
      priv->dev->broadcast[9] = pkey & 0xff;

      result = ipoib_dev_init(priv->dev, ppriv->ca, ppriv->port);
      if (result < 0) {
            ipoib_warn(ppriv, "failed to initialize subinterface: "
                     "device %s, port %d",
                     ppriv->ca->name, ppriv->port);
            goto device_init_failed;
      }

      result = register_netdev(priv->dev);
      if (result) {
            ipoib_warn(priv, "failed to initialize; error %i", result);
            goto register_failed;
      }

      priv->parent = ppriv->dev;

      ipoib_create_debug_files(priv->dev);

      if (ipoib_cm_add_mode_attr(priv->dev))
            goto sysfs_failed;
      if (ipoib_add_pkey_attr(priv->dev))
            goto sysfs_failed;
      if (ipoib_add_umcast_attr(priv->dev))
            goto sysfs_failed;

      if (device_create_file(&priv->dev->dev, &dev_attr_parent))
            goto sysfs_failed;

      list_add_tail(&priv->list, &ppriv->child_intfs);

      mutex_unlock(&ppriv->vlan_mutex);

      return 0;

sysfs_failed:
      ipoib_delete_debug_files(priv->dev);
      unregister_netdev(priv->dev);

register_failed:
      ipoib_dev_cleanup(priv->dev);

device_init_failed:
      free_netdev(priv->dev);

err:
      mutex_unlock(&ppriv->vlan_mutex);
      return result;
}

int ipoib_vlan_delete(struct net_device *pdev, unsigned short pkey)
{
      struct ipoib_dev_priv *ppriv, *priv, *tpriv;
      int ret = -ENOENT;

      if (!capable(CAP_NET_ADMIN))
            return -EPERM;

      ppriv = netdev_priv(pdev);

      mutex_lock(&ppriv->vlan_mutex);
      list_for_each_entry_safe(priv, tpriv, &ppriv->child_intfs, list) {
            if (priv->pkey == pkey) {
                  unregister_netdev(priv->dev);
                  ipoib_dev_cleanup(priv->dev);
                  list_del(&priv->list);
                  free_netdev(priv->dev);

                  ret = 0;
                  break;
            }
      }
      mutex_unlock(&ppriv->vlan_mutex);

      return ret;
}

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