/*
 * 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");