text: /*
   * Copyright (c) 2012 Mellanox Technologies. -  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.
   */
  
  #include <linux/netdevice.h>
  #include <linux/if_arp.h>      /* For ARPHRD_xxx */
  #include <linux/module.h>
  #include <net/rtnetlink.h>
  #include "ipoib.h"
  
  static const struct nla_policy ipoib_policy[IFLA_IPOIB_MAX + 1] = {
  	[IFLA_IPOIB_PKEY]	= { .type = NLA_U16 },
  	[IFLA_IPOIB_MODE]	= { .type = NLA_U16 },
  	[IFLA_IPOIB_UMCAST]	= { .type = NLA_U16 },
  };
  
  static int ipoib_fill_info(struct sk_buff *skb, const struct net_device *dev)
  {
  	struct ipoib_dev_priv *priv = netdev_priv(dev);
  	u16 val;
  
  	if (nla_put_u16(skb, IFLA_IPOIB_PKEY, priv->pkey))
  		goto nla_put_failure;
  
  	val = test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
  	if (nla_put_u16(skb, IFLA_IPOIB_MODE, val))
  		goto nla_put_failure;
  
  	val = test_bit(IPOIB_FLAG_UMCAST, &priv->flags);
  	if (nla_put_u16(skb, IFLA_IPOIB_UMCAST, val))
  		goto nla_put_failure;
  
  	return 0;
  
  nla_put_failure:
  	return -EMSGSIZE;
  }
  
  static int ipoib_changelink(struct net_device *dev,
  			    struct nlattr *tb[], struct nlattr *data[])
  {
  	u16 mode, umcast;
  	int ret = 0;
  
  	if (data[IFLA_IPOIB_MODE]) {
  		mode  = nla_get_u16(data[IFLA_IPOIB_MODE]);
  		if (mode == IPOIB_MODE_DATAGRAM)
  			ret = ipoib_set_mode(dev, "datagram\n");
  		else if (mode == IPOIB_MODE_CONNECTED)
  			ret = ipoib_set_mode(dev, "connected\n");
  		else
  			ret = -EINVAL;
  
  		if (ret < 0)
  			goto out_err;
  	}
  
  	if (data[IFLA_IPOIB_UMCAST]) {
  		umcast = nla_get_u16(data[IFLA_IPOIB_UMCAST]);
  		ipoib_set_umcast(dev, umcast);
  	}
  
  out_err:
  	return ret;
  }
  
  static int ipoib_new_child_link(struct net *src_net, struct net_device *dev,
  			       struct nlattr *tb[], struct nlattr *data[])
  {
  	struct net_device *pdev;
  	struct ipoib_dev_priv *ppriv;
  	u16 child_pkey;
  	int err;
  
  	if (!tb[IFLA_LINK])
  		return -EINVAL;
  
  	pdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
  	if (!pdev || pdev->type != ARPHRD_INFINIBAND)
  		return -ENODEV;
  
  	ppriv = netdev_priv(pdev);
  
  	if (test_bit(IPOIB_FLAG_SUBINTERFACE, &ppriv->flags)) {
  		ipoib_warn(ppriv, "child creation disallowed for child devices\n");
  		return -EINVAL;
  	}
  
  	if (!data || !data[IFLA_IPOIB_PKEY]) {
  		ipoib_dbg(ppriv, "no pkey specified, using parent pkey\n");
  		child_pkey  = ppriv->pkey;
  	} else
  		child_pkey  = nla_get_u16(data[IFLA_IPOIB_PKEY]);
  
  	if (child_pkey == 0 || child_pkey == 0x8000)
  		return -EINVAL;
  
  	/*
  	 * Set the full membership bit, so that we join the right
  	 * broadcast group, etc.
  	 */
  	child_pkey |= 0x8000;
  
  	err = __ipoib_vlan_add(ppriv, netdev_priv(dev), child_pkey, IPOIB_RTNL_CHILD);
  
  	if (!err && data)
  		err = ipoib_changelink(dev, tb, data);
  	return err;
  }
  
  static void ipoib_unregister_child_dev(struct net_device *dev, struct list_head *head)
  {
  	struct ipoib_dev_priv *priv, *ppriv;
  
  	priv = netdev_priv(dev);
  	ppriv = netdev_priv(priv->parent);
  
  	down_write(&ppriv->vlan_rwsem);
  	unregister_netdevice_queue(dev, head);
  	list_del(&priv->list);
  	up_write(&ppriv->vlan_rwsem);
  }
  
  static size_t ipoib_get_size(const struct net_device *dev)
  {
  	return nla_total_size(2) +	/* IFLA_IPOIB_PKEY   */
  		nla_total_size(2) +	/* IFLA_IPOIB_MODE   */
  		nla_total_size(2);	/* IFLA_IPOIB_UMCAST */
  }
  
  static struct rtnl_link_ops ipoib_link_ops __read_mostly = {
  	.kind		= "ipoib",
  	.maxtype	= IFLA_IPOIB_MAX,
  	.policy		= ipoib_policy,
  	.priv_size	= sizeof(struct ipoib_dev_priv),
  	.setup		= ipoib_setup,
  	.newlink	= ipoib_new_child_link,
  	.changelink	= ipoib_changelink,
  	.dellink	= ipoib_unregister_child_dev,
  	.get_size	= ipoib_get_size,
  	.fill_info	= ipoib_fill_info,
  };
  
  int __init ipoib_netlink_init(void)
  {
  	return rtnl_link_register(&ipoib_link_ops);
  }
  
  void __exit ipoib_netlink_fini(void)
  {
  	rtnl_link_unregister(&ipoib_link_ops);
  }
  
  MODULE_ALIAS_RTNL_LINK("ipoib");
  